After reading this post – I think I have the same issue.
I have the widget set to display 7 days and it was working fine for a while, but then on Friday May 1, I saw it had 14 days listed (May 1-14) in the widget. If I changed it to 6 days it worked, but 7 or 8 days just kept showing all the way to the 14th. I didn’t have time to look at it over the weekend. Today (Monday) it’s still showing dates from May 3 to May 14.
Then I realized that it’s not show all events for that period, but there is one week-long event which starts on the 7th and runs to the 14th. It is the only item listed for the days that exceed the specified 7-day period.
This is not good for 2 reasons…
(1.) I only want to see 7 days so the list is shorter, (And the title is: 7-day Calendar!)
(2.) It looks like there is only one event on those days beyond 7, when actually there are many other items on the calendar for those days, but it is only showing the week-long event for those days which exceed the specified 7 day period.
I hope that is clear enough. I’ll be happy to help where I can.
You can see it in action at a temp site I put up: https://pec.davidwiebe.com