A would like to ask for your opinion about three pictures below. There is a yellow strip on each of them, but is moving from side to side. I think that it is a problem with shutter of my Canon 5D3 - but I am not sure. The reason is that it is not happening always. Mostly it happens under some mixing light conditions, for example bulb light and fluorescent. But if I use a camera outside or in studio, there is no problem at all. So, I am not sure if the problem is really made by shutter (it actually has about 200 000 counts), or by some problem with metering system of white color balance (if it is even possible)..
Thank you for any hints or opinions, what could be possibly wrong.
EXIF info for pictures:
+ 0,3 EV
auto white balance
Sigma 35/1,4 Art lens