Lets suppose I invest 1 ETH in an ICO. When I check its value before it merges with a tradeable coin, Delata allways use the ETH price of the day that I bought it ( e.g. 1ETH=800USD=0,1BTC ).

But if today 1 ETH=400USD=0,05BTC, the real value of my ICO holding is half of what Delta shows, so my total portfolio value is overvalued.