Filter with Date Picker sometimes returns strange results ?!

I often use this feature to quickly filter notes, for example for weekly review, it’s quite handy:

However lately, maybe in past couple months I’ve noticed that in the result I get some files that I’m sure I haven’t touched/modified.
Although I cant demonstrate this behaviour in this post, still I’m pretty sure that I’ve noticed at least few times in past couple months.
For example last week I filtered last 7 days (selected dates 30 Jun - 5 July) and in the result I had a note from January that I’m sure I haven’t touched it in past 7 days.

Anyone had idea why is this so ?

Maybe not related with this, but it was strange to me as well the following: before updating to DT4 I visited my customer account page. On that page it says when last time you accessed databases from which Mac. What got my attention is that is was saying that I accessed databases from my test Mac on 30 Jun, but my test Mac was offline at least couple of months ?

If this should happen again, then please post a screenshot showing the filter, a selected & problematic item and the Info > Generic inspector. Thanks!