Sweet burn smell when stove dampers down?

We are burning BioPower from TSC and I'm wondering if anyone else has ever experienced a sweet burning smell from their pellet stove? Ours is equipped with a flame detection probe as you can see in the picture resting on the burn pot. Every once in a while I will get this overwhelming perfumed sweetness burn that will drag me out of bed some 80 feet away, to inspect the stove. I just sat through 2 cycles and it seems to be strongest at the end when the stove is shutting down that I notice it most. No smoke coming out of it that I can tell. We've only had this particular stove set up since Thanksgiving. Prior to this, we had a stove from TSC for a few years in another part of the house and never experienced the sweet smell with it. (Though i do think we changed pellets this year.)

We are burning BioPower from TSC and I'm wondering if anyone else has ever experienced a sweet burning smell from their pellet stove? Ours is equipped with a flame detection probe as you can see in the picture resting on the burn pot. Every once in a while I will get this overwhelming perfumed sweetness burn that will drag me out of bed some 80 feet away, to inspect the stove. I just sat through 2 cycles and it seems to be strongest at the end when the stove is shutting down that I notice it most. No smoke coming out of it that I can tell. We've only had this particular stove set up since Thanksgiving. Prior to this, we had a stove from TSC for a few years in another part of the house and never experienced the sweet smell with it. (Though i do think we changed pellets this year.)