I did see a video on adjusting the level.
A fan in the room, temperature, a bit of dust or a hair can throw off the readings.
I had to make a quarter turn adjustment to balance the bubble from side to side.
I had my ways pretty even last night, I’ll check it again this morning.
I am expecting movement as the night cooled down and the cast iron and the level stabilized.
I’m now embarrassed I used a construction level. Yep it was level, only to have this one peg to one side.