If it was only in the pending stage of the transaction (still reduces your available money), but not actually confirmed for withdrawal, then Colorado just did not follow through with the final steps to take the money out. It may just come out again in a few days.
However, if there are 2 transactions, one where it comes out and another where it is put back in, perhaps they found an error for your benefit adjusting the liability. If that is the case you will receive a letter illustrating the difference. If you are concerned either way, I would advise calling them at 303-238-7378.