Howdy. No, there is no invisible flag and you have not been muted. I would suggest that you shouldn't upvote your own posts and comments. There are many people that choose not to support users who upvote themselves. It can take a while to build and grow an audience here. I mention many of these things in those two posts i gave you the links to.
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thank you. Yes, I remember.
I follow this (liking myself) and I don't do it. Thank you