This made me 0_O for a while, and I was thinking that it's a bug--and wondering how to circumvent it---until I realized that the hyphen in electro-chemistry wasn't a soft hyphen but an actual hyphen. It should read:
You are attempting to create the tag electrochemistry ; however the tag electro-chemistry already exists!
(The line break is important)
Please, can this be improved? It's confusing when the line break comes right after the hyphen.