I don’t use modern design mode, and this is one of the main reasons.
Your ‘fuzzy’ selector looks for items that look like your selector. And because of that it finds dozens.
Your selector states: give me an element that has a parenid with a specific name.
It’s like asking a family with 12 children, to point out the one who has a dad named John… in the same family that can be multiple if not all of them (depends a bit on the mother I suppose ;))
You need to make your selector more specific, or just flag off the fuzzy selector and go for an exact target selector. Use an anchor if that is required to make it 100% specific.