Portfolio items not showing up

[reinisg]

Hello folks!
I have very strange problem with portfolio items list (first attachment image). The main problem is that, in portfolio page is showing category list of portfolio items categories with their count. But under the list, in DOM portfolio also are printed, but with out content. Every item has sample image, text and featured image, when I go into special item, all content is showing up normally.
I can add that, in development in local server in portfolio page everything is good and items are showing up, but in the production server – not. I have checked also media folder, images are uploaded and content are correctly.

What causes this problem?

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[David Martin – Support]

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Thanks.