Pentair Intelliflo Variable Speed programmable pump

I have programmed this pump to start at speed 1 860 rpm from 9:00 a.m. to 4:00 p.m. when it automatically switches to speed 2 at 2800 rpm........It is supposed to go off at 8:00 p.m. but it does not. It continues to run until I shut it off manually. I have checked the A.M. P.M. settings to make sure they are correct as well as the proper time on the pump LED screen.............I have tried to reprogram it a second time, but the result is the same......Tonight when I had to shut it off when it wouldn't go off at the 8:00 p.m. hour, I accidentally hit the "menu" button instead of the on/off button......and it went off..........I will wait until tomorrow at 9:00 a.m. to see if it resumes its cycle without me pushing the on button.........I am perplexed as to why this is happening. Any help that you could provide would be most helpful.Thanks

Ron