My budgie keeps losing half of his wing feathers and tail every time a new one grows

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Diet, hygiene and environment all play an important role in a budgie's overall health and well-being.

How long have you had this budgie?
What are you feeding this bird?
How large is the cage you have the four budgies in? Length, Width, Height
What kind of toys and perches do you have in the cage?
Are the other birds plucking at this budgie's feathers?
Does the budgie over preen itself?

The bird needs to be seen by an Avian Veterinarian for a proper diagnosis and treatment plan.
Avian Association of Veterinarians

Feathers - A Window into your Budgie's Health

Avian Vets have special training to determine the cause of symptoms resulting from illness or trauma.
This is important as "regular" vets will often overlook symptoms that are quickly obvious to an Avian Vet.
When you rely on anyone who has not had training in Avian diagnosis and care, you may be delaying effective treatment.
This can prolong suffering that may be avoidable.
The bird will often require a more intense, prolonged treatment with a poorer chance of full recovery than it would have if you seek prompt professional diagnosis and treatment at the first sign of illness.
If there are no Avian Vets near you, please find an Exotic Pet Veterinarian with experience in dealing with small birds.

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So sorry for the late reply.
I've had this budgie for 7 months now and for the first 3-4 months he had a stone on his leg and we thought it was a tumor and had to be removed surgically or something but it automatically came off along with his nail and now he walks very well just like the rest of them but when he had the stone he couldn't really walk properly. Could this be a disease? Because he's just grown his wing feathers after months and tail is coming out too. He seems to be normal and preens just like my other birds and doesn't have bald patches when molting so it could not be a sign of French moult too. And the cage is quite big and they move around a lot and there's ladders and swings and toys in general and I take them outside the cage for playtime too. And I mainly offer them carrots, cabbage and cauliflower a lot bc they tend to like it. But it's the wings in general what I'm worried about. And they also feed on tbe mineral block and I recently bought cuttlefish bones. But what do u suggest for healthy wings/tail growth so when it grows again it doesn't fall off. Thankyou so much for your help everybody who's answering )

You need to have the budgie examined by an Avian Veterinarian if you have not done so to ensure it does not have a nutritional deficiency or underlying medical condition.

Avian Vets have special training to determine the cause of symptoms resulting from illness or trauma.
This is important as "regular" vets will often overlook symptoms that are quickly obvious to an Avian Vet.
When you rely on anyone who has not had training in Avian diagnosis and care, you may be delaying effective treatment.
This can prolong suffering that may be avoidable.
The bird will often require a more intense, prolonged treatment with a poorer chance of full recovery than it would have if you seek prompt professional diagnosis and treatment at the first sign of illness.
If there are no Avian Vets near you, please find an Exotic Pet Veterinarian with experience in dealing with small birds.
Locating an Avian Veterinarian

Your budgie needs to be given a complete healthy and varied diet.

Additionally, as Cody indicated, depending on the metal mesh used on the cage, the bird could have Heavy Metal Poisoning.

Have you read the budgie articles and stickies as advised in my previous post as well as the information in the links I provided?

Yes the pictures I inserted are very recently taken and I bought the cage when it was readymade so I don't know if it contains zinc or lead. And thanks for the advice I'm going to invest in a good cage very soon. Actually he was in separate cage back at the pet shop and the shop owner sold a bird with deformities which is very cruel of him and my dad didn't notice he had a stone on his leg and a few weeks later we realised all our birds were able to fly except him. I'll try to find a picture of the stone for you to see. So I was thinking maybe it's because of an underlying medical condition or a deficiency. I might have an avian vet very close to my house so will definitely take him there and get him checked out. And yes I'll try my best to provide him with a varied and a healthy diet Also what I mean by his wing feathers and tail feathers falling out is that the tail grows for a few days and automatically falls off again,, like his wing and tail growth is never healthy. Maybe it's because of some deficiencies or the main cause would be the stone that was on his leg. It was quite big, roundish and covered half of his finger. And I'm going to insert a picture of the cage for you to see