The images I tried to submit were very small (abut 300 x 400 pixels, each less than 30K).
It is very odd because when composing the message, the images appeared in-line with the text just fine.
But, when I submitted the post, they got messed up as you saw.
Subsequently, I tried composing a test message with the same images, and instead of submitting it, I did a 'preview'.? Again the images got messed up.