thanks a lot for bringing this to our attention.

Mycelium iOS and Android have unfortunately different xPubkeys:

for the first account, Android uses
    while iOS gives you
    These pubkeys have different purposes: the Android Pubkey allows tracking of all incoming addresses and change addresses.
The iOS Version excludes the change addresses and only provides the "external chain".

We talked about this internally, and the iOS version will change, Since the m/44'/0'/0' version has a few usages today, and of course we want compatibility.