We recently had installed an American Standard h2Option siphonic dual flush toilet. Any bowel movement that is above the water line stays there even after repeated flushes. I held a mirror under the rim and even though there are holes at the back, only a few drops of water comes through from the back with a flush. Have to continually clean the toilet.

You may have got a faulty bowl or something's blocking the rim holes, Go back to the seller and ask for a replacement bowl under warranty at no charge to you. Good luck, Tom