I would use one of the other UIs. PaperUI doesn’t support sitemaps, and HABmin sitemaps have some issues and this is probably the cause of your problem.
I would try the ClassicUI or BasicUI for now.
The issue is that there is no sitemap concept in OH2 - only the OH1 concept. So, from a HABmin perspective, I’ve been a bit wary of spending too much time on sitemaps as earlier this year they were going to be upgraded for OH2. This hasn’t happened yet, so I guess maybe I should fix the OH1 version…