Yes, there’s also two settings. I think Automatically unpin topics refers to any manually pinned topic. And Default topics automatic unpin only refers to topics that the system pins by default, like the welcome topic and “About this category” topics.
Do we actually need to distinguish the two? And if so, should we improve the descriptions so the difference is more obvious?
This doesn’t explain why topics don’t stay pinned for @mcwumbly? Did you change the pinned statuses manually?