Disappointingly Confused

I have up till this point had great experiences with this app. Very, very helpful. However, something rather fundamental irks me. The app would seem to be graphing two equivalent equations differently (one is simplified, the other is not).

Plug in:

y1=(2-1)-(((2-1)-(1-2^-1))/2)+(((2-1)-(1-2^-1))/2)sin(x)

and then try:

y2=(2-1)-(((2-1)-(1-2^-1))/2)(1+sin(x))

"(((2-1)-(1-2^-1))/2)" was been factored out to simplify the expression, and yet now they are perfectly OUT of phase! What?! I feel I may as well write

y1=1-5+5*(2)

and

y2=1-5*(1+2)

And Im Just Being Nice about EduCalc Classic Pro, v7.6