Routing on category

I have one part of the routing done, where is will filter through one.
However when I try and filter again from a sub menu it is just not working and I am getting error and no page loading:
Example: http://testing2019.thegunnery.com.au/gun-care/
and select one of the sub categories and you will see it errors.

I really cannot see what is going wrong its not passing the query from what I can see but I just can’t see why.

Any help would be really appreciated as I’ve been stuck on this for a day now.