Re: Worried I'm causing fights with other parents
I would also just keep doing what you are doing. If it's important enough to one of the parents, they will come to an agreement together, but it won't really be your problem.
I had issues with my ex letting my daughter go places with his friends, because I felt like my ex wasn't responsible enough to make that choice. But, I wasn't married to him either, so we obviously didn't have that trust level in the first place. If we'd been married, I'd have trusted his judgement more. (meaning, I didn't marry him because he was a bit if a doorknob)