Sometimes I make a typo whilst tagging. Usually this is quickly resolved, correcting the typo and removing the litter.
However, when I accidentally leave a space between a tag that has an underscore, it leaves two tags: the separated tag, and another separated tag with an underscore attached to it. I tried removing those tags with underscores attached to them, but they refuse to disappear.
Any particular reason why the system does this, and how to fix it?
I tried both deleting the entire tag, and doubling the tags by attaching the missing tag part to the one with the underscore. Both failed.
Updated