The definition of double-booked is to promise the same room, seat, table, etc. to two different people at the same time. For example:
The Master Gardeners Club had to postpone its monthly meeting because the community center’s conference room was double-booked.
Based on my comprehension, both the Master Gardeners Club and another group accidentally reserved the community center’s conference room at the same time, so there seems to be a problem with the booking system. Is this analysis correct?