Having some confusion there for sure:
AVG internet security + Malwarebytes + windows defender
You are not able to run by default all 3 actively.
There is also no need for a 2nd opinion scanner since you already have Malwarebytes.
Finally, as others said, 3 ad blockers is just going to conflict.
If you want a script blocker, then there are other extensions. Otherwise stick to Adguard from that trio list.