I hope Im doing this right...

Ive been a member of this community for awhile, but Ive never actually posted anything here. But Im having trouble in Photoshop. I checked the memories and I didnt see anything about this so I was hoping someone would be able to help me out.


I was following a tutorial that involved curves and when I went to get a new curves layer, the first rgb looked like the picture they showed, but then when I went to do the blue, the line is supposed to be almost straight, but mine like bends and goes to the right.
Here are pictures

Theirs



Mine



would anyone happen to know why? it caused the end result of the tutorial to look very odd. I hope its not something silly that Im doing wrong, some setting or something.
thanks to anyone who can help

♥