Are you sure you didn't sign up for some bounty in the past with those addresses? That could probably be the reason why you have those contract calls. Mycelium accepts Ethereum and probably you must have signed a contract with one of your Ethereum addresses and that s the contract you see on the wallet that says from you.
On the other hand if you sign up with that address for some contract then the one that says to you is probably a contract call.

Welcome to the forum anyways looking forward to seeing you around