It does this to me but only with the default "user" group. For some reason, it's not saving the limit for that group correctly:
"prop"
{
"user" 20
"respected" "20"
"moderator" "20"
"trainee" "20"
}
The prop limit for all the other groups goes in quotes, except "user."
mrt might be having that same problem. It's not a big deal but I have to set the limit for that group every time I restart the server or reload the map.