Why do rooms in Exchange appear to display different information?

We have four meeting rooms set up as resources on our Microsoft Exchange server (2010).  Two of which one person set up, two of which another person set up.  They're both no longer here.  The first two rooms (Room A and Room B) show the details of the meeting (The name of the meeting, the owner of the meeting, etc.).  The second two rooms (Room C and D) only show "Free / Busy / and Tentative).

I'm by no means an expert with exchange, basically poking around with it because no one else will take care of this.  But I can't figure out the difference.  I've compared their properties in EMC and ADUC, and they all seem to match.  I'm sure this is simple, and I'm spending way more time on this than I should.  Any suggestions? (we want it to show the detail, not just "free, busy, tentative."