This happened to me on my last trip, and I don't know why.
You might cancel all 3 for the day and start over, it worked for me. And 10 days out, you should not have trouble booking the same 3 attractions (if it were Feb 6 today, I would probably not cancel!)
PS - I tried to book VOTLM on 2/06 just now, just to see, and latest it let me grab was 6:15 to 6:25 for the 6:30PM show. Last show is 6:55PM so... yeah it didn't let me pick the last show!
You might see when you get there though, this show is not packed in the evening, and probably do not need a FP for this, unless it was a busy day (crowd calendar says it's only a 4 out of 10).
This FP does not give a special seat or anything, you get a shorter line into the holding area, so if stand-by line is not long like in the evening, you don't need this FP really. If the stand-by line was long, FP only gives you a better chance to get into the next show.
So overall, shows at set times are not a good use of FP, even for Fantasmic. No special seating there anymore, just a slightly shorter wait to walk in with everyone else, still have to get there early to get a good seat.