The release issue

Please mark tracks as 'explicit' where the lyrics contain swear words or cover violence, drugs or sex.

Look, artistically you have the freedom to express [almost] anything you want. However, it's not to everyone's taste. If there is any explicit content or language it has to be identified. 

How can I fix the issue?

When uploading your track, first confirm that the song contains lyrics. The explicit lyrics field will appear where you can select 'Yes'. 

If a track is incorrectly marked, it won't be distributed worldwide. So take your time uploading your tracks to make sure everything is correct.