just recently someone had the problem that OH stopped “reading” his items-file after a certain line and never parsed the rest.
Maybe you have the same issue? Happens sometimes when you edit files in a windows environment and transfer them to linux afterwards. try deleting the file and recreating it with nano or vi(if it’s really just three lines).
Instead of checking via json request, in karaf console try:
smarthome:items list LR*
output should list the items including Groups the are in
smarthome:items list iRoom
output should list how many members the group has
If output shows item as not belonging to Group iRoom and group members for iRoom as Zero…then i have no more idea.