I recently spilled water (and ouzo, don't ask....) on my new keyboard.
Any questions one could have just answered themselves.
Typing the "4" a few times above, and having to correct "44" several times made me realize the problem is much more common than I thought. I'll take apart that button again, and order a new keyboard if it doesn't work. Unreliable numbers can create much bigger problems than sending too much Merit.
I had to replace my OLD mouse recently because the left button was double clicking every time I wanted to single click. It came on slowly, and before I figured out what was going on I accidently sent 10 merits twice. Both times it happened it was to the same individual who is very deserving, even if wasn't necessarily for those two specific posts.