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I've never seen multiple analytics scripts on a website cause the bounce rate to be inaccurate. Most likely there is some code on the website or in one of the tag managers that is firing an event which causes Analytics to not count it as a bounce. A lot of vendors will implement this to game the system and make their bounce rate look good because car dealers naively put a lot of value on it.

Unfortunately is no way to easily identify who has access to each unknown UA or GTM code though. You would either have to email all of your vendors and ask them if any of the UA/GTM account numbers belong to them...or just delete the ones that aren't yours and wait until someone complains or something breaks.

Then going forward, never allow a vendor to place new analytics or google tag manager code on your websites. Instead give them access to your analytics at a special vendors view (as I mentioned in one of my earlier posts) and give them non-publish access to your google tag manager container if needed.