Can't click on two buttons at the same time on gaming mouse

When I play Fortnite i want to build quick. I noticed that my gaming mouse "Star Raider CND-SGM1" doesn't recognize when I FIRST hold my left click and than I click on "back key" on the side of my mouse AT THE SAME TIME. All other combinations of clicking and holding works... I uploded a picture of what keys I mean here: https://imgur.com/a/jBmpfJL

I tried to test my mouse here https://unixpapa.com/js/testmouse.html, but this specific combination also doesn't work.

I know what is keyboard ghosting. But I guess that mouses have same problem???

My question is... if your gaming mouses have the same problem and how do I know which mouse has this problem and which doesn't?

Solution 1:

As you already mentioned yourself, this is most likely a ghosting problem. Not quite ghosting, but rather jamming. But these are both rollover problems

"Gaming" mice often register themselves as additional keyboard device to your operating system and they can suffer from the same problems. Either your hardware can't handle the combination of certain keys, or the driver on your computer is not fit to recegnize given combination. (some source here)

It seems like your mouse is of medium quality and does not provide proper key rollover for the thumb buttons. I dont't think there is much you can do besides ensuring that your driver is up to date.