perfect pairs paid wrong?

so i hit perfect pairs on a live blackjack table last night, got two jacks same suit, should be the max payout. the dealer pays me like 20 to 1, not the 30 to 1 the table showed on the sign. everyone at the table is side-eyeing each other like did we just get shorted or what. i didn’t even argue because i was up on the night and didn’t want the hassle, but now i’m replaying it in my head thinking about how many units i lost on that.

just curious if anyone else has actually been paid the right odds for perfect pairs or if the payout display is just for show.