I occasionally post comments on things on this feedback forum. It's been a couple times now that I visited a thread I've seen before and I noticed the 'voted' icon for me is ticked. Sometimes, I don't remember voting and even left a comment about why I think an idea was not the best.
So I tried typing a comment (sorry for that, there is no delete button) and the 'voted' button did not change. So I figured that wasn't why it ended up ticked. But after a refresh of the page, it was ticked. And I was added to the list of voters.
I undid the vote, refreshed -> it stayed unticked. I made another comment, and refreshed the page -> it says I voted for something I didn't vote on.
It should either be clear that leaving a comment implies a vote, or it should not imply a vote at all.