Tasks not staying checked off or moved, time keeps being added

When I check off a task it doesn't always stay checked off and often rolls over to next day unchecked. If I move a task to another date it sometimes reverts back to the current date. Sometimes I add items and next time I open the app they're not there. Also a time stamp keeps getting added to my tasks, saying it's from midnight to 1am on my phone but just saying 1 hour on my computer.

I really like how Week Plan is organized but the many consistent bugs I've seen are quite frustrating. Any ideas what is going on and how it can be fixed?