Those are existing in the dwg.

I'm sorry my explanation is not clear.

Can you try a new hatch in any other room or outline:

Hatch placement:

~ if you select the boundary option the dwg reverts to extents - no hatch is visible.

~ if you select a point within the boundary option - no hatch is visible (altho one gets the 'undo hatch' option.)

I have attempted this with various hatch scales 100 to 2000 - no success.

I hope this helps.

Gray