Bitcoin fund disappeared from my Mycellium account
The block explorers show that this address received 0.04526392 BTC today and spent it all two hours and a half later. Either this is an intermediate address or someone with your seedphrase / private key sent the money somewhere else.
The address with the current actual balance of 0.051 BTC is 1CqxsGigGw1ufiGJUYnjLNuSqsRkLfJ2R6.