I have a strange problem with Magento 2.2.3. A few month ago we added some category images and they were shown correctly. Today we added some new category images and changes some of the old ones. But no new image is shown and also changed images are not shown. Category page always shows old images ... in admin new category image is correctly shown.
We run reindex, ran:
cd httpdocs && find var vendor pub/static pub/media app/etc -type f -exec chmod u+w {} \; \
&& find var vendor pub/static pub/media app/etc -type d -exec chmod u+w {} \; \
&& chmod u+x bin/magento
and also tried to set permissions to 777 of folder and files.
Anyone an idea what is wrong?