Gift Certificate - Multiple Currencies

I have enabled only 2 currencies (USD) and (LKR) and I've set the convertion rate too. Rate on the product pages are appearing perfectly except gift certificate. When I create a gift certificate with a value of Rs. 1000 and when when I previewed, it shows Rs. 136,054 whereas it should show Rs. 1000

I don't have this issue when I select USD. In the mean time, my convesation rate is 0.0074 How do I fix this.