I'm quite new to the dev side of the site, so I might be misunderstanding something here. But when I go to "Filter Jams".

I'd expect categories "Starts This Week" and "In Progress" to not overlap at all, assuming "This Week" starts at T=the time of browsing and ends in T+7 days. But visiting https://itch.io/jams/starting-this-week tells another story... for the record, this screenshot was taken today (May 16th)

I thought maybe I understood wrong what "This Week" means and it means a calendar week, but... not really. Visible on screenshot "OPR Writing Jam" starts on May 22nd (in 6 days), so I couldn't have been that far off. So no matter which interpretation of "This Week" is taken, something's fishy here.
The most egregiously miscategorized result is "smilejam", which started over a week ago and can't be counted under "Starts This Week" no matter how you slice it.
Oh, and "Upcoming" and "Starts This Month" categories don't fare much better - both list plenty of in progress jams. For "Upcoming" it feels especially contradictory...
I have one more request - if the Powers That Be decide that freshly started "in progress" jams indeed should be listed under "Starts This Week", please give add an option "No In Progress Jams" or similar to More Filters.
Thanks in advance for taking a look at this issue!