Why may "page=n" extension be added at the end of our topic links?

as shown in the image the not found pages for our site by google has started to increase. at the end of the links which are not found by google, there is a ?/page=n extension; which results in not founding the address.

the url itself exists, but the url+?/page=2 doesn’t’; which is how discourse works. but I wonder why such extension is being added to the topic addresses. does anyone have any suggestion?

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Most likely reason for something like this either that a bunch of posts got deleted from the topic OR that google just is using some internal heuristic.

Our topic HTML tries not to put invalid pages in the HTML

That said, certain deletion sequences may throw stuff off.