on a couple of images if i try to delete a tag that doesn't belong, it just says post updated but doesn't take it out. i tryed multiple times but no luck. maybe it just on my account idk. the pic is post #64627 with the tag being ♥ (not the image of a heart but in words like & hearts;)
can anybody try deleting it and see if it works for ya?

Figured out a way to do it. I went to the tag history, selected the line where the ♥ was added and clicked "undo" to undo only that tag change. Fortunately, on that post, ♥ was in a tag change by itself. I think the booru's code was getting confused by the existence of both ♥ and ♥, as &hearts is the html code for ♥.

Also, "&" is the html for &amp, so "♥" is how you can avoid a space before the &amp when trying to convey ♥.

thanks for the info