Kohls has changed the return policy for the products that you have purchased using "kohls cash". If you return any item that you bought "redeeming kohls cash", they will send you back the kohls cash instead of Merchandise store credit.
Earlier it was easy as they give store credit.
From kohls website:
Are you returning merchandise that was purchased with Kohl's Cash?
If you are making a return or price adjustment on an item you bought with Kohl's Cash®, the value of the Kohl's Cash® coupon will be returned as Kohl's Cash.