question about syringes

i didn’t know where to put this question, so here it is in chit chat.

anyway…about syringes.

when i load my dose in the syringe upside-down (needle pointing north), the measurement looks different from when i hold it right side up (needle pointing south).

what one should i be going by?

(i’m talking i’m trying to get as accurate as 1/4 units so one way it looks 1/4, the other way it looks 1/2, for instance).

anyone else notice this?