Littlewoods Casino Bonus Question

[BigBluffer]

I joined Littlewoods last month to play their monthly poker bonus. They also gave me a 50 Pound no-risk casino bonus with a 20x WR. I played that off today but lost the 50 Pounds. My cashier's page looks very strange now.

Before playing: Balance = 197 pounds. Withdrawal Limit = 147 pounds. The extra 50 pounds was the pending bonus.

Now, after playing and losing 50 pounds: Balance = 147 pounds [makes sense]. Withdrawal limit = 172 pounds. What?!

How can my WD limit be 25 pounds more than my Balance, especially after I just lost the 50-pound pending bonus? What does this mean?