Experimenting with solaris and the /obj hair guidegroom workflow.
Inside the guidegroom node I've painted a length and other attributes.
I go inside /stage lopnet which has sop imports for the geometry and hair.

Often after sculpting points on the geometry (not adding any new points) I see results like the attached.

To fix this I have gone to the guidegroom hair paint attribute node clicked on the "recache strokes" button
and sometimes had to hit enter in the viewport or switch from surface to volume back to surface before I see the paint
back to where it was.

This manual fix has worked so far but is it some kind of node cooking issue?

Please submit a bug to support, along with details of if you have experienced the same issue in earlier versions of Houdini or not. It would also be helpful if you included a file with your submission.