Because of the way Binance's API works, it is impossible for the CryptoTrader.Tax engine to automatically detect coins you have received into your Binance wallet from disbursements such as forks or rebates.
If you do not manually account for these disbursements, they will trigger Negative Balance Warnings because it looks as though they appeared in your account from thin air.
To account for these please:
1. Navigate to your Distribution history. To get there go to Wallet > Spot Wallet > Distribution History as seen in the image below.
2. Enter all distributions that you have received into the "Incoming Transactions" section within step 3 of the CryptoTrader.Tax app.
Make sure to include the correct amount and proper timestamp.
This should eliminate Negative Balance Warnings you are getting from Binance distributions.