What is the ruling on designing free websites and forums that display the Noble Qur’an, where its pages are erroneously turned to the right instead of the left? And is there a sin incurred by that?

There is no sin upon you as long as you did not intentionally err, but rather it occurred out of forgetfulness, for Allah, the Almighty, says: "Our Lord, do not impose blame upon us if we forget or make a mistake," and because the Prophet, peace and blessings be upon him, said: "I have done so." However, you must quickly change and correct the error, and draw attention to it on the website.