If I play part of rank A, select rank B, then select rank A again, the game takes me to the first unsolved level of rank A, as expected.
If I play and complete all of rank A, select rank B, then select rank A again, the game takes me to the last level of the rank, instead of the first as expected.
Intended behaviour is that it'll take you to the first level in the rank that you haven't solved. If you've solved the whole rank, then perhaps indeed, the behaviour should be to go to the first level of the rank. This makes sense, and should be fairly easy to implement.
Implemented this change for the next update.