Hello, maybe this is wrong topic, excuse me for this.

I have a problem,  that I bought previiously xrp and polkadot on crypto.com app, amd sent it to my Atomic Wallet. When I wanted to sell my coins back to crypto.com and from crypto.com to my bank account, I was attentioned that 1 DOT and 20 XRP must leave in my walllet. I said what? This is my 20% of my coins. Large losses, it is a disaster. Hen the support said that something it is with dot and xrp contract, so not thhe wallet miistake. It is what it is, for everybody,or justme, or can I do something? All coins what I have must leave in wallet some enermous percentage, so clear losses? Wtf, what can I do now?