Some odd flavor and mystery fibers

I have a couple weird questions about what’s going on with my product. We are running a lower quality material “old machine trim”
Running a filter of Celite 545 t5 and silica
Nice perfect yellow color shatter after a 72 hour purge or so. The dabs have a very distinct smell and taste of burnt popcorn or burnt hair. Anyone can tell me what that taste might be?

Second question:
We are having little chunks of what looks like glass particles floating around right after our crc column.
We have multiple layers of higher to lower micron paper filters below. at the bottom a indofab 5 micron sintered filter disk