There are two Leviathans in Rhamus G-10, one in the ring and one a little far out (Roughly 10km), aswell as 6-8 queens that are all deep spaced, along with the other hive NPC's.
I followed them out for about 70km before leaving the sector for a few minutes to see if the sector would reset itself. (It didn't).

Pretty weird, but not the first time it's happened after this stuff was fixed

The latest restart should fix this issue. If it still happens, let us know with a support ticket.