Something about Thanks and Poll results from before the migration...

all thanks seem to have been wiped, until I try to thank an old post, which it turns out I have thanked before, and the thanks count goes down to -1, (as it counts as an 'un-thank')

but also when I 'hover over' the Thanks button, a pop up drop down appears listing at least 4 other users who have previously thanked that post... (theres also the text/ button width formatting, but that happens on all 'thanks')

also, seen recently Beasty added a note to a prominent thread with a poll in it, saying results are not to be trusted. This was highlighted within a couple days of the migration, i think two-option polls had results swapped, the one Beasty commented on seemed more complicated than that... results swapped and amalgamated or I don't know. I presume there's no way of either wiping all votes since migration and 'fixing' the poll, or wiping all votes from before the migration, on any poll on the site ?