In Spanish, we have a phrase..
En casa de herrero, cuchillos de palo.
Literally,
In the house of the blacksmith, wooden knives.
The meaning is probably clear, but some examples:
A math teacher whose children cannot add.
A software engineer who is still using Windows 95 at home.
...a country which supposedly leads the world in technology and industry, yet is still incapable of providing the most basic of manufactured goods needed to confront a major crisis and must import them.
Is there a comparable expression or phrase in English that describes this situation?