SlimStat seems to be showing too many hits in the monthly and daily view:
For example, I right now see 106 hits to "smartphone/datenblatt.php", a page I removed last night and adapted (manual) links to it some time later. I see the number 106 when hovering over the URL in the "top pages" widget.
When I click in the page, i.e. filter to only see hits to this page, I end up with a graph and stats only showing one hit. This looks like the correct number.
I have seen similar things before, like a page that has not been updated for a year receiving many hits, which is unlikely as the content is outdated now. Filtering for that page, the number reduced significantly, to a more realistic magnitude. I guess in this case I was seeing hits from a year ago in the "top pages" widget.
Similarly, I have the impression of seeing hits from yesterday (or even longer ago) in the first example I mentioned.
Can you have a look into this?
If it helps I can send some screen-shots or even a small video showing the effect.