Last time i checked, I remember that there were a lot more caption and pov_sub posts (such as a pov_sub manip of this: rule34.xxx/index.php?page=post&s=view&id=6127433 ), now when i look for them they disappeared.

Does anyone know why whey were deleted, and where i can find them?

Good chance that the person that did those captions wanted them removed.

EDIT: OperationTransport got it

That caption was made by neko_alchemy and were removed because of signed manip rules. I'm guessing the captions you want are by the same person since there were a lot of manips by them deleted for the same reason.