A reverse ND grad should not look like a standard hard grad. Its darkest area is near the transition line in the middle, with the density becoming lighter toward the top. If your filter appears evenly dark toward one end like a normal hard grad, then it likely is not a reverse grad.

The "RG" marking does suggest reverse grad, but the visible density pattern is the real test. If it doesn’t show that darker center band, you may have received the wrong item or a mis-marked filter. Compare it with a product image from the manufacturer or retailer and contact the seller if it doesn’t match.