Activity: Last visited the site ...

When I go to my profile, the subject for some reason constantly shows me the current time, but not the time when I logged in to Habr as a last resort.

Is this a bug or a feature like this?

In general, it is logical: since I have already logged in, then this is the last time ... :)
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You can then rename the subject a bit and do it like this:

" Activity: The last but one time was on the site ..."

and set the date and time of the last but one call.