I'm not figuring out what is causing this, but often when I right-click, the menu appears then quickly disappears... the time it takes seems random, I'm not finding anything consistent about it.
The same thing happens with other mice... is there some setting that determines this? I just want the menu to stay until I click something in it or click outside of it.
macOS Sierra Version 10.12.6 iMac i5
Any non-Apple mouse