Seems that possibly a few issues occurring considering you are also receiving that "quota" error. Note that quota also tends to include the number of files. But, would inspect the folder permissions for the images directory to be sure that it is writeable.
As to the current issue of not displaying the image of that product: well, ran a quick html validation:
https://validator.w3.org/check?uri=h...Inline&group=0
And there were errors identified, which may impact the overall display. Reviewed the source code for the image and was able to access the image from the server.
Now then, after loading the page some 4 different times (to inspect different areas) the image is now presented though the same number of errors exist in the html validator. Not sure what, if anything, has changed since first reviewing.
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