My first night with the wireless cameras - is this normal?

Hello all... I spent the better part of today mounting several stick-up wireless cameras, along with doorbells and a chime pro.I am still getting the system set up and was looking at the cameras at night... One of my cameras seems to have a vertical line running from the top of the screen clear to the bottom. I didn't notice it during the daytime, but then again I was not looking really close either. Any idea what might be causing this? Is this something I should be concerned about - ie if there is a hardware issue it spreading. It is pretty high up and I need a 20-foot extension ladder to get to it, so if this is a bad sign of things to come I'd rather get it fixed sooner than later.Thanks all!