Except “no problem” traditionally means “no problem [despite this situation containing a likely problem]”.

It means the person being thanked has gone outside their set of responsibilities to help you.

Like “Thanks for letting us borrow your spare tire so we could get our car back to town” -> “no problem”.

Here the other person had no responsibility to help with the others’ flat tire, much less lend out a piece of their own safety equipment.

“You’re welcome” is the one which means “It is perfectly expected in our current roles that I would have provided this”.