Will my upvotes be replaced if I manually upvoted a post?
No. In other tools if you upvote any post twice with different upvote weights, the first upvote is overriden by the second upvote. In the Hive.vote this problem is fixed. You can upvote any post manually before applying auto upvotes and the manual vote will not be overriden.
So, on Hive.vote, the first upvote takes it all... all the others are skipped... It says manual upvote, but it's the same for any upvote..