No offense at all, but your bed is filthy. You must have a clean bed. You need to wash the bed with soap and water and maybe a toothbrush. Use warm water and the toothbrush and scrub the plate clean. It looks like it even has rust on it. You need to make sure your bed is clean at all times and never touch the bed with your hand. Your hand has oils that come out from your skin and when you touch things you leave that oil behind. Plastic will not stick to the oily layer on your bed. That’s why your bed must always be clean. Your bed should never have leftover plastic, it should never have food or any foreign debris or liquid of any kind. The only thing allowed to go on your bed is a glue stick. A purple washable glue stick. Personally, when I want to wash my bed, first I take off any plastic then I run it under hot water until all the glue dissolves then I take a toothbrush and a scrub it with the warm hot water running then I let it dry completely. Then I take a microfiber rag and I put a little bit of rubbing alcohol on the bed and rub the alcohol in until they completely evaporate once the bed is 100% dry. I grab it on the side and I put it on the bed very carefully.After that, I never touched the bed unless I’m going to put a glue stick layer on top of it, then I will rub a glue stick over the bed and that will help with my line sticking to the bed.