SSF and tablets

Is there some type of a bug? I'm level 85 Kitava warrior on SSF, and I have never seen a ritual tablet, breach tablet, expedition or delirium drop once. All I've got is a irradated precursor and I got about 25 of them.

I'm trying to craft for SSF as there's no trading, and it seems impossible besides a desecration.

Anyone have any wisdom on this?