E*Trade Dividend Bug

If you have an investment account with ETrade and some shares of SPY ETF in your portfolio, chances are the account total is much higher than it should be. After signing in this morning to check my balance, I saw some bogus numbers and thought I had been hacked. After calling ETrade’s customer service number, an automated voice message confirmed there has been a recent dividend payout bug. What could cause something like this to happen?

Update: as of 10:45am CST, the issues seems to have been resolved