Accuracy of Stelo CGM versus Contour Next finger stick glucose meter

Comparing the 2, often they are commonly 20 points difference, even when no food intake for 3 hours. Sometimes as much as 40 points different. Contour Next meter is always lower. Changed to a new Stelo, and still same results. What the heck? Drop the CGM and go with just the finger stick? The CGM just is always so much higher. It's so frustrating. Just to clarify, it doesn't matter if just ate or ate 3 hours ago, Stelo is always at least 20 points higher than Contour Next meter. What's going on?