Why some stocks have 100% delivery for few months

Why few stocks are showing 100% delivery from past few months. Is it a part of operator playing or these are just damn good stocks. Or the 100% shown in BSE website is wrong/insufficient data. https://preview.redd.it/xqrwebj50wbe1.png?width=1890&format=png&auto=webp&s=0f377c13e0717ac1610209dd50b56a9173c55ce9