When I first read other people reply, I though they were all sarcastic, and that it was maybe a stupid idea. But at 90 cents for 20 push buttons, I though I could risk 4 cents over a possible solution to an extremely annoying problem. So I took a new button, straiten the pin, and twisted them 90 degrees:
Wow ! The button is not “clipped” in the bread board, but it doesn’t tend to pop out anymore, and it improved the situation by at least 90%. That’s a very smart advise.
Big thank you Member #183815 !