Investment accounts are usually set up as a current asset. If you want to track the balances, you need to set up an other income account for unrealized gains/ losses. Gains and losses are not realized until you sell or cash out your account.
Delete the original transaction you set up. It is likely going into the opening balance equity account which is incorrect. It needs to go into retained earnings or if you are a nonprofit....unrestricted net assets.
Record a journal entry each month to reflect the new balance and the other side of the entry is the unrealized gain/loss account