MomijitheRabbit said:
Warning: Someone is hiding Art From Index and also changing Tags to random tags, I managed to change mine back and unhide them so peeps, please keep an eye out on the others, if they suddenly vanish from the index or have weird tags associated
The reason your art was hidden was probably because you posted a lot of it all in one go. This site likes to avoid mass posting by a single user as it pushes some art off the front page that hasn't been there long. To avoid this a Mod usually hides some art pieces to free up space. When posting its recommended to post about 3 images in a bunch and then the next day post another 3 and so on.
Edit:Imasuky beat me to the punch :P