This is due to having selected different pricing sources between your portfolio and your watchlist. You can choose the source of the price for a coin in your Portfolio and Watchlist separately.
If you want to change the pricing sources, please read this article here.
PRO TIP: Please note that the pricing source can only be changed for cryptocurrencies.
PRO TIP 2: The default pricing source would be the DGA if this is available. If not, it will be one of the available pricing sources.