According to a separate post this is a known issue...anyone know of an ETA on the patch from Adobe?
Have you tried the latest one that they released this week?
I have tried it with the latest patch applied RoboHelp and it is working fine at my end.
Index looks fine in the WebHelp output.
We have fixed this bug in the latest patch release. Please make sure that you have updated the RH. Latest build after applying patch would be 18.104.22.1688
For applying patch, go to Help>updates and apply the update available.
If after applying patch also, you face this issue please post here.
Thanks, all, yes, the patch worked!