Cabela's Backorders
FAQ from their site cold be the reason
Cancelled Backorders
Why was my backorder cancelled?
Due to dramatic changes in market conditions, Cabela's has cancelled backorders for certain high-demand products. As always, it is our goal to deliver the same top-quality products and high level service you have come to expect from Cabela's. However, we believe it's better to cancel backorders than to present unrealistic expectations to our valued customers.
But don't know why they would give that excuse.