Why are two octave scales so tricky?

My piano teacher has taught me to play on the C, G, and F key already so I learned to play a one octave two handed scale with proper fingering. So I thought I'd try two octaves. Whats wierd is that when I play 2 ocatves one hand at a time it's easy but if I play two octaves with two hands I mess up somewhere. I have sheets with all the scales with proper fingering so I know Their right but I mess up somewhere.

I guess you are begginer, so your brain will take some time to develop hand independency. Just go slow and with time you will go faster

guess you are begginer, so your brain will take some time to develop hand independency. Just go slow and with time you will go faster.

Well not exactly, I think I have alot of independence of my hands but when I play a two octave scale in two hands my hands get twisted in the keys (kind-a hard to explain...)

I'm wondering when you say two octave scales do you mean for example C MAJ: RH C4-C5 LH chords or both hands going C to C because I'm a lil confused on that.