Voting issue, can't reduce from 2 votes to 1 vote

Votes are very limited. So I tried to remove 1 vote from some items which I voted with 2 votes. But votes cannot be reduced but only removed. This would be OK if I would be able to add 1 vote after removing all votes. But this is not possible: if I vote again then 2 votes are added again if 2 votes have been geven before. I can’t find a way to reduce from 2 votes to 1 vote.

Maybe you could increase votes in General? There are much more good ideas in the forum I would like to vote.