Magneto displaying tax but taking tax off the tax :S

Question

So I have tax set up at 20%. The actual rate it’s taking off is about 14%

I noticed that the figure it’s showing is actually the correct Tax figure minus the tax.

Which is crazy.

Here’s what it’s doing.

Subtotal : £100 Tax : 16.68 (which is 20 - 20%) Total without tax : 83.32

It’s deducting tax from the tax figure before it displays it.

I can’t imagine this would be a setting, who would ever want to do this.

I have all the setup correct, it’s applying the correct rule, it’s just deducting tax from the tax figure.

Any thoughts?