I think tests are never 100% right, they always have a percentage of error and that's normal, and this manga is about just that. An omega that has been misdiagnosed as a beta, and everything always ends up working out when an alpha arrives.
I found the line and the art beautiful, the plot is almost identical to all the others but it's cute to see the good relationship between them.
Kami-sama wa Chotto dake Ijiwaru