EU VAT module “VAT is not Valid”

I’m using BOOSTER EU VAT NUMBER module

I have some BELGIUM VALID VAT numbers.
BE0789871889
BE0797131746
BE0408716428
BE0424450719

But only for the first VAT number i receive the message “VAT is valid”.

For the other numbers i receive message “VAT is not valid”.

Changing Validation Method to cUrl or Simple doesn’t help.

What can be wrong?

Kind Regards from Belgium
Andy