[throwaway-jim]

not sure about raw cinnamon but i've taken a bite of the cooked version and it was distinctly sweet every time.

[flutas]

My only thought is maybe ceylon ("true") cinnamon vs cassia cinnamon.

Ceylon is supposed to be sweeter, but cassia is the most commonly sold form in the US.

Could just be a difference in exposure to types of what flavor you expect/experience.