Brand new hair system is REALLY curly and wavy at first? Is this normal?

[BalderbytheMinute]

Hey guys, so I got a backup system ordered from my stylist but it is SUPER wavy and almost curly. She says this is "normal" for all new hair systems because they come with a wave to them that straightens out over time. But, is this really true? Is there a way I can just order the hair to be straight without any curl? Definitely not liking how obvious of a difference it is with the waviness when I get a brand new system.