If it's a low amount that you're seeing as a negative balance it's likely due to your fee + the amount you last sent was more than the amount you were intending to send. If it's not that then it's likely due to a lack of confirmation on your most recent BTC spend, as that's what "splits" your wallet.
Nope, please check that public address which is given. It seems that 0.004 btc something in that address. It's not an negative value. If you are advising for a lack of transaction confirmation which takes too much due to low fees set in the transaction. Therefore, set the default transaction fee for a mining network. It take almost 40 minutes to confirm the payment.