Problems exporting tiffs using AI cc 2018

When I export a tiff from illustrator CC 2018 version 22.1, it actually started before that, It only export parts of the images if some of the images on the file are bitmaps. If the images are all vector it exports them fine. I am using settings of greyscale at 400dpi and 200 dpi, sometimes the images will export fine on the 200 dip and not ok on the 400 dpi and sometimes it will cut off parts of the images on both.

If someone has an answer that would be great!