Self-employed in a secondary occupation VAT on EU purchase invoices?

Hello,

I am a secondary occupation nail stylist and purchase my products from my Swedish and Dutch suppliers.

As I have a vAT number and am exempted from vAT declarations, I have never been charged vAT on my purchase invoices.

Now, when I enter them in Dexxter, I keep getting a notification saying that I should have been charged vAT.

Was it invoiced incorrectly before, should vAT have been charged?

Can anyone advise/explain this to me?

Thanks in advance!