user gets logged off every time they click on a different post

[nogridhome.com]

I have no idea how to address this.
Not every but many times the user gets logged out to guest when they click on something on my site.
How to correct?
thanky!!
https://www.nogridhome.com

Same guy never received the confim email - not in his spam folder. Any ideas?

2.2.8 P1

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