Yes, there is a bug in version 2.1.9(2) which affects the move program up feature. Basically instead of moving it up, it apparently overwrites the previous program with the one down. It has been fixed in the most recent release 2.1.9(3). You can follow the firmware update instructions below to update your firmware to 2.1.9(3):
https://openthings.freshdesk.com/support/solutions/articles/5000832310-opensprinkler-3-x-firmware-update-guide