Generally, I would not recommend mixing tires because you would want your traction at all four corners to be similar and consistent. I would recommend replacing all four tires.
However, regardless of what tires you get in the future, you need to address the problem that your front tires are obviously not being loaded properly. If you don't correct this, you will find the same thing happen to your new tires.
What tire pressure are you using on the track? What about alignment? If you have stock suspension, you should consider pulling the pins on the top mounts to get you some more camber.
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