There wouldn't be a difference using a community account or an alternative account to upvote. Community account is the same as any other account but with numbers on the end. That is all the difference.

The Community page is like giving publication rights to the members to post on the wall of the community account. Only that the front end seperates this into its own page instead of it appearing directly o to the account. Its like the public writing on your wall in facebook. Except the wall is in an entirely different page of its own.

It's the frontends that are having trouble. Not yours his or hers or mines account. An rpc issue it seems to report. I'm sure the witnesses already know about it. I don't know what has been done about it though. Maybe another fork to adjust this is coming. And another illusionary vote for change lol