It seems as those your image hosting service is not very good. On multiple occasions, across multiple documents an image that was once hosted correctly and rendered as expected failed to render.
It’s very frustrating as we rely heavily on your ability to host and render images.
We’ve seen this before, but only very sporadically. It’s been difficult to reproduce in any reliable way. Is your “Screenshots” column a formula and is it formatted as an Image URL or Images that are uploaded?