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If you have a miscalibrated bubble level on a truly level surface, the bubble will sit more toward one side - say, left. Flip it 180 degrees, and it'll shift to the right.
On an inclined surface, the level might read level one way and show incline the other way.
Here you could just adjust the screw until the bubble stays in the exact same spot no matter which way you flip the level.
That assumes that it's the bubble tube that's not installed evenly but doesn't remove the problem the other person suggested, which is a non-flat or non-squared other side?
Not entirely. Like the OP mentioned, (may not have explained it well enough) you would just adjust the ampule's rotation so that it will report the same offset either direction the level is oriented. I.E. if the bubble is 5mm to one side of the ampule when the level is facing one direction, it should report the same offset but at the opposite end of the ampule when the level is reversed.
does that make a practical difference?
Not at all, but neither does OPs request hahahah. There are more hard core leveling devices if a cheap bubble level isn't good enough.
Here's one extreme example of what they are describing, other situations might also be bowed, twisted etc.
Doesn't matter. Most levels aren't "two sided" like that anyway but have a top and bottom.
Okay, now I’m picking up what you’re putting down. Thank you! Off I go to test my levels! 😅