Can't add a custom name to variant

[ebo8302]

I'm trying to add variants to a product. I need to add a variant for "flavor" and then list things like "house blend", "breakfast blend", etc.

Every time I create the variant option, and try to name it "flavor" it defaults it back to size. I tried setting it to one of the other presets like "style" and then tried tying in "flavor" but it'll just revert it back to that option name. 

I've closed the product and went back in, but it keeps doing this. I even tried creating a new test product to troubleshoot but it keeps doing the same thing.