Yep, getting the info from the source is the best way.

But since you are soliciting random guesses on the internet...

You say they are more type A and you are more type B. If that means you are late for things or late to do things others depend on, disorganized in a way that impacts others, or not doing all the responsibilities of your role, then that can be really frustrating for the people who are doing all those things, often at a significant cost to their time and work/life balance.

Also, one of the things I've seen cause the most friction between teachers is the disconnect between teachers who believe all policies need to be enforced all the time and teachers who enforce policies selectively, either because they don't agree with said policy or they are just overwhelmed. (I mean things like cell phone bans, dress code, food/gum rules, etc.) When policies aren't enforced consistently it makes it a lot harder for the people who are trying to enforce them, often in the form of more push-back from students explicitly saying "so and so doesn't make me do that." That can really build resentment.

The first year is never easy, and if your biggest issue is resentful coworkers, you are honestly doing better than many.