Lol Alex30.
It seems strange to me that you can deal with LTSpice which is not easy but are missing a few of the fundamentals of electronics.
I dont mean to be disparaging either, keep trying, you will learn this stuff.
LT1001 was a bad opamp to use
Yes some op amps have borked models in LTSpice but I would imagine the LT ones would be ok. But hey at least it is an opamp. LT1017 is not a useful replacement as it is a comparator and not an opamp.
The difference between these two is not always that great.
An opamp is meant to operate in it's linear region and has good linearity over it's operating range. So is used to accurately amplify differences.
Whereas a comparator is meant operate as a switch, thus has very high gain but not as good linearity.
In many places you can use one instead of the other, in many places you shouldn't.
I am guessing U1 and U2 need to go back to opamps and you may get 6 volts.
7V typical offset voltage
Better read that datasheet again. That number is too high for an offset voltage.