Good news: Ken Shishido is allowed to change his vote in the ongoing BU election, so every BU member is too:
https://bitco.in/forum/threads/voting-is-open-for-buips-113%E2%80%94116-118%E2%80%94124.23924/#post-93088
Do you think it would alter the final vote?
It's probably just Ken correcting his vote. Am quite sure no one else will be "changing" their votes.