There tots is. :P e.g. Serosurveys of kids show significantly lower positivity rates than adults (fewer kids have had it); PCR testing of kids shows higher positivity rates than adults (a greater proportion of kids tested have it); other studies show seroconversion rates of kids are nearly as high as adults after infection.

The only way to get this outcome is if negative kids are less likely to be PCR tested than negative adults, or if positive kids are more likely to be PCR tested than positive adults, or both.