How can I fix Urp Shadow rings?

Ive installed unity 2020.1.3f1 and created a urp project but while i was creating a terrain i saw a shadow ring rendering ive tried to fix it looking for a solution but i really didnt found anything to help me solve the problem at the end i just reinstalled the unity version but the ring still there. then ive tried another unity version( 2020.1.0f1) another urp project and the ring still rendering near a terrain. any idea to fix this error ?