Changing from AE to Entreprise independant

During the course of this year I have become a fully fledged business and have also changed from profession liberale to artisan. This has involved a fair amount of difficulties but have now been accepted by RSI but have just noticed they have changed my SIRET number. Is this usual? Has anyone else been through this process? Thanks for any help anyone can offer.

I believe that part of the code indicates the type of business, hence the change. Mine changed last year because I work from home and I moved...!