Yes! It drives me mad! Principles is the worst offender - I tried jeans in a normal 10, fitted fine but too long, tried the same pair but petite, couldn't get them over my arse.
Petite should mean shorter ie leg length or strap to boob length, but fur some reason they often come up smaller overall.
A 10 should be a 10 but it isn't.
Best ones are Fat Face and MnS which scales down but keeps sizing the same.