Looking for answers about RVN wallet

I'm mining RVN since a few weeks and i'm using the RVN wallet on iOS.

Here's my problem (or is it? it feels like a problem but could be normal, i'm a total newbie in the crypto world) : the wallet where the mined RVN are send is not the same on the iOS app (showing up when i click on receive), yet i can see the RVN i received from etherminer on the app.

Is it possible the wallet number has changed ? I stopped mining RVN a month ago and started agin today.

I'm kind of scare that if one day i have to recover my wallet the key words would not be the ones i wrote down when i first setup the wallet.

Thanks for you help!