Because there were only three in stock, so you're waiting for the re-stocking. You should just cancel.
I received my first kit fine before I posted about it but wouldn't you know that my second order came with just 1 grip (in a great big box). Well I called and complained and they sent me a replacement via UPS 2 day. Just received it and it's the full kit! Funny thing is they are going to pay for me to return the single grip. Seems like the freight would be more than just eating the cost of 1 grip.