Apple Watch screen issues

I recently purchased the Apple Watch SE Gen2 and after using the watch for just four days, without any incidents of dropping or mishandling, I noticed a glitch that occurs right after typing in my password. A thin blue stripe appears momentarily on the screen, and then the display returns to normal. This glitch is quite puzzling to me, as the watch is brand new and hasn't been subjected to any physical damage. I've tried restarting the device, but nothing change.

I went back to the store, the staff do some checked up and they exchanged for me a new one. But this new Apple Watch still has the same glitching issue, the problem persists.

Does anyone have experienced a similar problem ? or if there are any known the reasons why? Maybe because of the OS (mine has already updated to the newest OS)?