Uneven backlight on screen (bright blob)

Hello, I recently received my batch 6 AMD FW13 (DIY edition), and everything seems to be working as expected, except for one small detail: there’s a small blob in the lower left corner that appears brighter (see image). It’s not very noticeable in regular conditions, but it’s clearly there when looking at an all-white image (regardless of brightness level). Is this normal or should I contact support?

Doesn’t look normal, I’d contact support.