CGM Libre2 vs KetoMojo accuracy?



So I just starting using the Libre 2 (2 week free trial) and it gave me some decent readings but After a 96 on the libre2 I did a finger stick on ketomojo and got 77. it also gave me 2.5 for my ketones (I just started back to “full-on” keto again after a long carbfest… way too long, but on the other hand I turned out to be a pretty amazing baker,

So, what to believe? What is the science here… I definitely didnt take too much Vitamin C. Early in the day I take 90 mg Vitamin C, no where near the threshold of 500(?) they (ketomojo) warn about.