First of all i’m a beginner so please don’t expect this to be professional but i need help

i want to use Tk() for my new window because i’m going to destroy the main one and let the 2nd running how ever when i use it it doesn’t let my label’s textvariable updates but with a simple change as using toplevel() it works, What the hell is going on??

Chatgpt doesn’t help he says a lot of nothing