I can’t reproduce the issue. Can you please try it on a default theme? Are you using plugins that might conflict?
It’s true that auto coupon’s can’t be removed, this is by design. The ‘remove’ link must not be visible though, what theme and version are you using?
It’s also by design that for Auto coupons the description is displayed. This allows a friendlier message to be presented to the customer instead of the couponcode.