I was like that - I always fussed and even drove back to the yard one day. So it may help you Ray Ray if I tell you what the yard said to me.
They told me I didnt need to worry what I had done - They are professionals, it is their job and responsibility to make sure the horses are all right - to check if students like me forget to shut the door or to twist the reins.
I now ride at a yard where horses are not left bridled and if we need to leave them for a bit, the reins are looped over the stirrup irons - the stirrup irons having run up the leathers.
Every yard one goes to one has to learn their own particular way of doing things. And I do like riding with reins that are not all curled from being twisted up.