Make sure you convert the time correctly from 12 hour time to 24 hour time. From Midnight to Noon the hours are in 12 hour format, from Noon to Midnight the hours just go up one digit every hour. I'm mathematically challenged so my list is my guide! I also keep a pdf of it on the cloud so I can access it with my cell phone if needed.I have the farmlite chicken door and it sometimes shuts, even though its not the time I put in. Just the other day, it shut at 3 PM, when it is scheduled for 8 PM. I do not know the reason for this
If that isn't the problem reach out to FarmLite - they're great with support!