2. Your topics could be public or private
The authors are responsible for choose the access to each topic created in his/her publication.
By the time they where answering they can choose respond it public or private. So, in case you do not see your interaction public, it's possible that the author has not yet answered your comment yet or has selected the 'Reply Privately' option, if so, you need to log into your Galoá's Account to be able to check it.