Config changes on its own

[IPAlot]

Have a 4 site network, calls are overflowed from site 1 to 2 then 3 then 4, using virtual users in overflow groups that forward to the short code which is the group at the next site, works fine, but the forward numbers change by themselves ie forward to ext 991 changes to ext 992, changes happens at all sites and evan the short code that points to the correct line group will change
All Small office 2.0.18

Soopa Doopa Intergalactic IP Office installation mechanic and configuration corruptor from way back.