Dread Guristas spawn non existent

Dread Guristas used to spawn at regular rate, not anymore.
In three weeks i had 2 Dread guristas spawned in Vale, with ratting anomalies at least about 6 hours every day. ( used to be at least 1 or 2 Dread Guristas every day )

Something happened after latest update.

is it only me seing that?

In 2 month constant ratting i looted only 5 pieces of ammo