Dynamic select within a repeat

I have a repeating table with two selects in them for; Category & Sub-Category.
When category is selected then it filters the sub-category (normally not a problem)

But in the repeat region it is changing all of the subcategories.
I need them to work independently within the repeat, is this even possible?
I am guessing it may be something to do with dmx-bind ID but I just cannot get it to work.

@Teodor I don’t know if you could shed some light on this?