Glad you like the app :)
On TravelFeed, only comments of users who have logged in with their Hive account on TravelFeed appear. This is due to our dual account system that makes it very easy for new users to join with Email/Facebook/Google even without having a Hive account (they can then create one later), the downside is that a Hive account only exists on TravelFeed after the user logs in once.
On the plus side, this keeps the comment section clean from bot comments (which some users prefer to be hidden), but unfortunately some comments of non-TravelFeed-users are missing.