Tax Rate Issue

Hi all,

Accounting is not my area of expertise, so aplologies in advance.

Im having a tax rate issues when generating invoices. 

When generating the invoice my tax rate is correct:

https://drive.google.com/open?id=1RAHfiRJMnBOGpuufuBNf6r97vBm5JxPN

But after clicking save the tax rate changes:

https://drive.google.com/open?id=1-nP4MTt8sZLcC7zqsivqd-er5NrZZWpn

Any help would be appreciated.

Thanks

Wynand

Correction

When generating the invoice my tax rate is correct:

https://drive.google.com/open?id=1W5RD2TyWOIUF_EOw7ustSrwFgIRHUDdN