While playing Roblox, my mouse stopped registering left-click when I was holding right-click to aim. I had to release one button before the other would work. I replaced the mouse, and it worked for a few hours, but the problem returned. Testing in Chrome shows the same behavior, so it isn't limited to Roblox. I'm using the mouse and keyboard with an iPad through a pTron mPort 360 adapter, which provides several USB-A ports and one USB-C port. My laptop is currently broken, so I can't test the mouse directly on a computer.
1 Answer
Since the issue happens with two mice and outside Roblox, the mice probably aren’t defective. The USB-C hub or the iPad’s mouse support is the more likely cause. Some hubs or tablet input drivers fail to pass simultaneous button presses correctly. If possible, try connecting the mouse through a different adapter or directly with a USB-C-to-USB adapter, and test it on another computer or tablet to isolate the problem.

I’m using the hub because my laptop is broken and I need to connect the mouse and keyboard to my iPad, so I can’t currently test it directly on the laptop.