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Price data errors in RSX

I have an algo that I'm testing out out on the ETF RSX that is showing some very strange fill prices.

On 3/11/16 in the transaction log, it shows:

Buy order for 6400 shares filled @ 12:19PM @$16.28
Sell order for -2000 shares filled @ 12:20PM @ -24.17
Sell order for-4400 shares filled @ 12:21PM @ $9.55

By fill price I'm referring to last sale price in the transaction log. In my universe of targets, RSX is the only one that has this behavior. It happens throughout February and March and it doesn't happen on the other symbols I'm running the algo on.