The "recent albums" will show in the reverse order (newest first) of when they were added to MC. If you've upgraded to 20 from 19, then MC20 will rescan your music folder but it wont know when these were added, they are all "day 1" effectively. So the order will be in the order in which MC tracked through your hard drive folder.
If "recent albums" has disappeared in JRemote then make sure this is one of the served categories in MC itself. Check in tools / options / media network / advanced / customisze views for gizmo & webgizmo. Make sure "recent albums" is listed in the "iitems to show" window, and add if missing.