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It doesn't look to me like there is any bug - there was a vote on that post from @estabond so it was unable to vote for it again and it refunded you your bid. Maybe @estabond liked your post and voted on it manually or maybe someone else paid for a vote on your post, i don't know, but the bot seems to be working as intended.

Hum.. I send it .300sbd he vote (yesterday), today he refund me .300sbd. Not normal I guess

Oh i see, i thought you got the refund right away - either way you got your money back and a vote so don't look a gift horse in the mouth as they say :-)

Yep.. I just want to give him the .300sbd he refund me.