Date discrepancy

Good morning

When you put the cursor over a reservation, the box with your information appears without having to open it.

However, the check-in and check-out date does not match with the actual date of the reservation in the planning.

For example, I have the reservation placed from May 1 to May 5 (and when I enter it, the date is correct) but when I quickly look at the information in the box, it gives the date from March 19 to March 23.