UI Glitch on https://trade.angelone.in/markets - Black Spot Appears and Disappears on Scrolling

On the web page Angel One, there is a black spot that appears on the page when I scroll down and then disappears when I scroll back up. This black spot is located at the top left of the page, near the logo. The black spot does not seem to affect the functionality of the page, but it is a distraction and can be visually jarring for users.

Please note that this issue occurs consistently and can be replicated by scrolling up and down the page multiple times.