Thanks guys,

So the bottom line after this long long wild goose chase is:

1. ProBackTest ignores the currency you enter in the testing tool, it uses the underline market currency and plugs-in the number you put in the system (10,000GBP become 10,000YUAN irrelevant of the actual currency exchange)
2. When using the system in real-life scenarios this does not happen and the broker actually exchanges the 10,000GBP to the underline currency)

I think this is very confusing and so very important to stress out on the back-testing tool especially next to the initial capital box

Thanks again for taking the time to explain this here