Glass sticked to bed....

Hi, i bought used Ender 3 pro, 2 months ago. I love it, owner gave me only glass bad so i putted it on bed, and was using it. I had some problems with leveling but after all, printouts overall they were rly good (with Creality Slicer presets). I started to mod Ender 3 pro, but i found out that most problems i have is with sticking and leveling bed, so i want in future go with bed leveling tool (EDDY). But before that i need and want to put PEI plate.

I remember that glass was moving a lot and i used clips, but right now....MY GLASS STICKED TO BED!

Can you tell me is this layer between plate and glass is normal part of bed ? Or maybe there where something extra that made glass stick ?

And if its a normal part, any idea how to disconnect glass from bed

- i tried to remove on 70C and on room temperature,

- i tried to push with some force and get some air between, but it didn't worked out.

I don't want use force to break something.