Error 520 and a weird Cookie

Hi there,

I am having trouble with my website (WordPress) true-tea .de. I switched to Cloudflare, but I am getting a 520 error after a few minutes. I did my research and figured it may have something to do with the size of the cookies.
I stumbled upon a cookie I never noticed was there before named “cpqsuh”. It contains various information, I wasn’t able to figure out where it’s coming from. As soon as I clear my browser cache, I can access the website as usual.

The site was working beforehand with SSL encryption. When Bypassing Cloudflare it works again. Reproducing the error can be done often by simply visiting multiple sites. I have the feeling the error occurs more often when logged-in.

I tried Chrome, Edge and Firefox and have the same issues in all browsers.

I hope someone can help me with this issue.

Thanks in advance!

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