My impression is, there is only a problem with one of your Performances: #2.
I would overwrite that Performance and rebuild it from scratch.
I see the same with random performances. For some reason the KPA seems to handle things better after scrolling past the same performances once or twice, but it still tends to randomly skip performance when using the front-panel buttons. Reporting it as a bug yields a response saying it is a known problem.
I have no problem scrolling between performances with the remote.
If there is a problem with a performance or individual slot I would prefer that the KPA produces an error-message so that I can take action. To silently skip due to incorrect or malformed data is not a good solution.