“You’re welcome” is too much of a commitment for me. What if I don’t want to help next time but already told the other party they were welcome to my help? Formally revoking that welcome sounds really awkward.

“No problem” is just more honest because it keeps the scope to the current episode. Unless it was a problem but I’m glossing over it to just end the episode, in which case it’s still better than “you’re welcome”.