Nested ANOVA(with 2 x-variables)

Nothing much specific can be said without a reprex. See the FAQ. Some function (the screenshot doesn't help me see which clearly) is performing a calculation that results in not-a-number values, such as

0 / 0 
#> [1] NaN

Created on 2023-03-31 with reprex v2.0.2

This post includes information from a highly reliable source that may shed some light on what's happening.