Some thumbnails disappear (Wordpress + website online)

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Hello.

I have an issue, some of my thumbnails disappear in my Wordpress gridder (except 5 of them) and then on my website the image is gone (black) but it's still clickable.
See the video for Wordpress and the screenshot for my website.

VIDEO
http://mateopicard.com/wp-content/uploads/2019/01/IMG_3208.TRIM_.mov

PHOTO

It's not the plugins apparently cause I tried to deactivate all of them and nothing changed.
And the problem is exactly the same on Safari and Google Chrome.

Thanks for your help.

Dear @mateopicard
this is the link to your website:
http://mateopicard.com/

Can you deactivate all the plugins and let us know if you still have the problem?

Best!

Marius

Hello Marius.

Well, as I was saying, I already tried to deactivate all the plugins, but still the same problem.

But I decided to change all my thumbnails and their mouseover by re-importing all the original files. And apparently it's working.

Dear @mateopicard
a perfect!

Let us know when the problem occurs again.

Best!

Marius