Disappearing Digifarm Gate
There is a bug in the game in which, for no apparent reason, the Digifarm Gate disappears. However, it can still be used and comes back later.
When leveling up, some relief Digimon may have their stats reset to single-digit numbers. This is rare and usually only occurs in the Digimon in the bottom right box. There is no way to fix this outside of re-earning the stat points through leveling, or by saving often and paying close attention to the stats of the Digimon.