Crypto market is very volatile, thus the same coin can have a different price on different exchanges.
On home page, CoinStats shows the global average price of coins across all the exchanges it is traded on.
On your portfolio, CoinStats shows the price of the coin in exchange you have it on or selected when adding the manual transactions.
For synced portfolios it shows the price of the coin on the exchange you synced with.
For manual portfolios/transactions in shown the price of the exchange you have selected while adding the manual transaction. You can edit your transactions and either change that exchange or completely remove it to see the global average price.