Mouse clicks are causing random box characters

[emwr]

When I used to left click once on my mouse, a X would appear and fill the box. Twice meant green dot.

Now I often find that one left click produces a green dot, which is not what I am trying for.

I am also getting a lot of reminders that I can't have 2 of the green dots in the same line when I am only left clicking once to add an X. It's frustrating because it takes a lot longer to play the game.

I'm wondering if anyone else is having this problem or is it a mouse issue on my end?

Suggestions?