Booking a meeting

Hello, we have a user who booked a meeting room from April
10 - June 15 for all day sessions during that time frame,
set the room as busy, and when the room is viewed through
anyone's Calendar it shows as busy for that full time
frame. But, if someone tries to re-book the same room as
if they are booking a new meeting the room only shows as
busy up to and including May 1st. Anyone know why we see a
different outcome between the 2 options? Thank you.

Regards,

Randy