It sounds like all of your accounts are linked, but in a negative way. Possibly using too many black hat tactics. You may have to start all over, but use an actual phone(s) instead of a proxy. You can get a cheap/used iPhone. You don't even need phone service to access Instagram on the phone, you just need an Internet connection. I use white hat tactics on my Instagram accounts, on one iPhone. I am sure all of my accounts are linked by now, but I have never run into these problems because I do not use very many black hat tactics on those accounts, if any at all.