727 No Fluid Circulation

I've not, it's on the dipstick but it is below full so I'll have to add more.

I tested Park, Reverse, Neutral and Drive. When it was in reverse, it went to drive first, then reverse. When in Neutral, it is actually in Drive. Drive is also Drive.

This could be totally normal with wheels in the air and low fluid.
Keep going, as it sounds like you are fine.