Link & Post Categories interfering

Did someone else come across this before / knows if this is a bug?

As soon as i add a link category that has the same name as one of the post categories, lets say category a, and then rename this link category to something else like category b, this change is reflected within the post categories, renaming post category a to post category b. Even though i never touched any post category, only renaming a link category.

The only thing I’d like to achieve is a blogroll split up into link categories, one link category has the same name as one of my main post categories…

Thanks for any help!