Error: VAT + VAT charged on checkout

Hi guys, my client alerted me to a strange error that started appearing on his store and I dont have a clue as to how to find the solution to this problem.
The VAT charge is supposed to be a once off 14% on total during checkout and has always functioned correctly until now.

Customers are now being billed twice for VAT!
This is how it looks on the invoices:
Sub-Total: R342.24
Shipping (5%): R17.11
VAT 14% + VAT 14%: R100.62
Total: R459.97

Under the heading "tax" on the invoice it says 28.00% which is obviously wrong.

Any ideas as to why things are now displaying wrong all of a sudden?
Ive looked at tax zones and definitions and everything seems to be in order.

Okay here are my settings:

Zones
Country |Zones ||Code
South Africa| Eastern Cape | EC
South Africa| Free State | FS
South Africa| Gauteng | GT
South Africa| KwaZulu-Natal| NL
South Africa| Limpopo | LP
South Africa| Mpumalanga | MP
South Africa| North West | NW
South Africa| Northern Cape| NC
South Africa| South Africa | ZA
South Africa| Western Cape | WC

Zone Definitions
Zone Name
South Africa
Zone Description
14% VAT

Number of Zones: 10

Number of Tax Rates: 1

Description:
14% VAT

Tax Classes
Taxable Goods
Description:
VAT

Tax Rates
Priority |Tax Class | Zone | Tax Rate
1 | Taxable Goods | South Africa | 14.00%


Number of Zones: 10
Number of Tax Rates: 1
Description:
VAT 14%

Anyone have an idea as to why tax would be charged twice on
checkout?

Im still trying to find a solution to this problem.
Any ideas of what could cause tax to be charged double?

Okay I have managed to fix the problem.:clap:
For those of you experiencing a similar problem. this is what
you do:
Look under Zone Definitions.
There you will have one column for country and another for zones.
Under the Zone column, look to see if there is a zone described as
"all zones", if so, then tax/vat will be applied twice during check out.

This is what I had:
Country------------Zone
South Africa ------Gauteng
South Africa ------Eastern Cape
South Africa-------Free State
South Africa-------KwaZulu-Natal
South Africa-------Limpopo
South Africa-------Western Cape
South Africa-------Northern Cape
South Africa-------Mpumalanga
South Africa-------All Zones

By removing the "all zones" above in red, Vat is now once again
being applied correctly.

I had the same thing, more or less in my store. I had the country in 2 different shipping zones, which were then used also for the tax zone definitions.

Pretty much, if it adds VAT twice, it is because you are telling it to somewhere or other as it only does what you tell it.
Drove me mad, but I managed to find it in the end.:clap: