VC post grid not showing

on my website: pinkwithstyle.co.il i have set up post grid with Visual Composer, but it will not show up on the page, and the strange thing is that when i activate or deactivate any plugin, refresh the page and it will show up once, and the second refresh it is lost again. and it happened every time i activate or deactivate any plugin.

the page is "Grid Test"
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