Some copper color this round of annealing?

[SDHNTR]

I just changed the propane bottle on my annealer. Only change from normal process. A few pieces of brass (Lapua .300prc) came out with more copper color than I’ve seen before. Not sure if this fuel can is hotter or if I somehow changed my set up, but this is new. Did about 80 pieces of brass and 6-8 of them came out like this. The rest look fine. Are these pieces ok or trash?

 

[SDHNTR]

Most look fine, like this.