Why do I keep loosing my progress

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I had an old template I deleted. And it has overrides all my work every single time. I am frustrated and ready to through it all away. I can't figure it out I even cleaned an apps I had to make sure they weren't causing it, but nope. I download a new theme to start fresh. It literally comes back and doesn't even let me customize. I was looking at a way to contact shopify and they only give me this. So can someone please help me.