There was a bug which caused other users to not see your posts and comments at 16+ posts.

*** What you need to do to fix this bug for your profile ***

1. Reload SkyFeed and check the version number on the left (Should be Beta 0.2)
2. Post something
3. Comment on a random post

This may cause one or two of your posts to disappear, but everything should now work fine for new posts.

Thanks to @covalent for finding this issue