Hey @iqingyuyu,
Typically we would see a negative coin balance like this if a recent coin purchase has been refunded.
Please take a look through our article here for more info, or see below.
Why is my Apex Coin balance negative?
If you get a refund in real-world currency, we’ll take an equivalent amount of Apex Coins from your Wallet. If you don’t have enough Apex Coins to cover your refund, your balance will be negative.
New purchases of Apex Coins will first be applied to your negative balance.
Any additional coins purchased after this point would go towards correcting the negative balance before they're available to use for further purchases.