First, it is not normal and there is a fix. Second, got me on what that fix is.

Give us as much info as you can. Settings on the camera. How you download (physically and software). All the software you use. Brand and model of monitor. Exact process that fixes it (decrease width). Does it fill the whole screen both stretched and fixed? What if you change the window size? What brand/model of computer and operating system? Can you post and example? - TF