I just bid on an already voted comment:

My bid was 0.1 SBD and was not refunded. https://steemd.com/tx/7e58e2d77f95f32b0ef0c4edb77eed2aa35957c1

This was the first time that I bid on it and it got voted on:
https://steemd.com/tx/5f06481dabdee9ac7f3ec77cc6198bb570ffd432 https://steemd.com/tx/08881dffa94dbf27ae068be23c5983070f374332