There currently exist both demographic and genre tags for shounen, shoujo, seinen, and josei. The XHR fetches only recognise genre tags due to API limitations, but the tag update performed on the manga page detects also demographic tags.
Effect: Some manga may not be filtered on the frontpage, but opening the manga's webpage shows that it's filtered by tag. This happens when the demographic tag is filtered, but is not included as a genre tag.
Solution: Supposedly Mangadex is updating the tag system at some point, possibly removing demographic tags. This bug will be left open for now.
There currently exist both demographic and genre tags for shounen, shoujo, seinen, and josei. The XHR fetches only recognise genre tags due to API limitations, but the tag update performed on the manga page detects also demographic tags.
Effect: Some manga may not be filtered on the frontpage, but opening the manga's webpage shows that it's filtered by tag. This happens when the demographic tag is filtered, but is not included as a genre tag.
Solution: Supposedly Mangadex is updating the tag system at some point, possibly removing demographic tags. This bug will be left open for now.