Mouse randomly reading right click on left click

msintros

macrumors member
This started a couple weeks ago with my old mouse. I figured it was just time for a new mouse so I bought another one. Well, it turns out the new one is doing it too. It's very difficult to duplicate. Out of 20 clicks maybe 1 will end up reading as a right click instead of a left click. It will go through bouts of being more frequent than that, though. It's incredibly annoying.

What could possibly cause this? Both mouses were wired, by the way.
 
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