Car setup differences in Free Practice and Time Trial

[Godsenddd]

Hello. I need an explanation. In Free Practice I set tyre pressure of Lotus 49 Cosworth at Nordsсhleife, for example, in front 1.21, in rear 1.14. Next, I go to Time Trial and at first I see in information display pressure that I setup. But when title "Manual control" appears at left, tyre pressure automatically set up to 1.51 in front and 1.42 in rear. Why does it happen? Thanks.

[Bealdor]

That's because you're setting cold pressures in car setup.
Time trial starts with pre heated tires, that's why the pressures shown are higher.

[Godsenddd]

That's because you're setting cold pressures in car setup.
Time trial starts with pre heated tires, that's why the pressures shown are higher.

I understood. Thank you very much.