ya mine does the same thing every now and then. I also found that it does NOT change lighting schedules to fit your timeframes very well.
For example i wanted to switch my light schedule to go from like 8 pm, till like 7 or so am the next morning. All my gsp, shrooms, xenia, kenya tree, and even other toadstool leathers open up like normal when i switch the light times. But the fiji yellow never takes to that very well. Once its established to a time, it likes to stay to that. So i ran my lights to the new schedule for about a week....it was the only coral that would not open during the new schedule. The lights were off during the day tho, so ambient light would shine into the tank. Well i guess that the fiji recognized that as its normal light, so it would open during that time still lol.
But mine does this from time to time anyways...like if i bump it or something. Its pretty picky unfortunately.