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This happens sometimes due to the fact that we're processing up to 8 transfers in parallel in order to process the transfers as fast as possible and sometimes, your vote is getting selected for multiple posts in a time-frame of a few seconds.

You can change your votingpower threshold to around 96-97% but keep in mind that the chance is there that if we experience unforeseen issues - your vote might not be cast for 1-2 hours and your votingpower could be stuck at 100% with a high threshold.

I have some questions to ask, is there something wrong with selling votes as of now?

I have the same question. Upvoting you to get the answer.

Votes can be delated due to node problems

Ahh I see thanks for the answer :) now i'm relieved :)