I have been doing real estate photography for last few months. I use sony alpha 7R3 mirrorless camera and FE 16-35mm F2.8 GM II Full-frame Large-aperture Standard Zoom G Master Lens. I get two questions mark type of light dark icons on each image in exact location. Since they show at exact locations in each image, as a common sense, i thought it could be due to some scar in the lens. I cleaned the lens but it is still showing. Not sure if it due to some menu settings or dirty lens. It is so strange. I can share the picture showing the two icons at exact location for all the image.

Did you - carefully - check for dirt on the sensor?

Take a photo of a bright monochromatic surface (e.g. sky, white wall) with a very small aperture (F/22 or so). Do you now see clearly defined specks? If yes, there's dust on your sensor.

Sensor needs cleaning. I can see another spot in the upper right corner in the first photo and just next to the air vent in the bottom photo. 

Edited July 19Jul 19 by Cameratose