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On our photo heavy site ([https://defensiefotografie.nl](https://defensiefotografie.nl)) we have problems with showing some of the jpg-images. Upon loading a page, sometimes and random a photo is not shown as can be seen in enclosed pic. Reloading the page (F5 in PC browser) shows the missing photos.
We use Cloudflare for caching with Super Page Cache for Cloudflare as plugin. Nextgen Image Gallery is used for most of our image galleries.
I already tried Query Monitor for weird behavior, nothing found. Lighthouse and GTmetrix show a decent respons. Wordfence is working at it’s lowest setting.
**I am out of options** for this annoying **random** behavior. Can someone give me a hint in what directing to search further? Thanks.
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