Premade vs powder

Kyleigh • 23, and a mommy to 2 beautiful baby girls! Avery London born May 5th, 2016 💕 Makayla Rhae born May 27th, 2018 💕

Second time mom here, didn’t know where to post. But is there a difference between the pre made vs the powder formula? My 5 month old has been on 3 different formulas. Alimentum, Nutramigen and now Similac Spit-Up. I put her on the powder and noticed she was still projectile vomiting, so I switched her to the pre made and we were doing wonderful on that. I was going through that SO quickly so I switched her back to the powder and she’s back to projectile vomiting. Is there something in the powder formula that’s not in the pre made formula that makes her puke?