Tips in how to

Approach my supervisor because sometimes they irritate me by sending me on my 10 too early and I'll try to see if there's anyway to send me later but they always say "well it's just what the iPad is telling me and I just follow what it says"

Fast forward another day this one time I was about to get sent on my 10 because I overheard so I went to check the iPad to see when I'm due. It wasn't until another 15min and we had plenty of partners(that were leaving way later mind you)

My supervisor tells me to go on my 10 and I asked " even tho the iPad doesn't say I'm due until later ?" They just nodded implying yup. Ngl I got so mad because wdym you follow what the iPad says and then another day you don't

I truly need insight on the supervisors side because I get along with them so it sucks when they pull this on me and I'd like to stay on their good side being polite bringing this up to them