Azure active directory B2C sign in logs

I’am using azure active directory b2c to handle authentification to my spa application! the user can sign in and singup successfully to the application.

in the users blade i can see all the users succesfully !

but the problem when i click on the sign in logs i don’t get all the sign in logs of all users , even that user had successfully signed in.

as the pictures below show , i always see the sign in logs for those 4 accounts ! so what’s the problem what should i do to see all the sign in logs