Hi! c: No no, don't be sorry. You're welcome to ask me, if it's something I can answer, hahaha. So, regarding your question, yes someone else might be deciding to move out the next day you declined other villager's moving plan.
If there's someone planning to move, or if yes who it is, those things are random. System decides it by RNG when you load a new day. So, sometimes there's no one the next day, sometimes there is. 2 days forwards or 3 days backwards or those method actually has no point. The only thing that's for sure is, after 10 days have past from previous mover, there's for sure someone who's planning to move, if you have more than 8 villagers.
I know how it is tiring. >.< Good luck!