Those look fine to me. Really long pellets can cause bridging that prevents them from feeding into the fire box. Dust can be a problem as well. Anything in between should work without any trouble.
In years past RT supplied this brand when their house branded stuff was out of stock. Speculation was that CP provided/packaged the house brand product.
I tried Cookin pellets once my 590 did not like them
did they draw moister in garage maybe but that's where all my other pellets are, had to dispose of them
keep getting ignitor error