I also experienced some issues with posts being visible on one page-load, and not on another.
Also clicking the notification (bell) icon in the top-right menu ocassionally pops up a modal saying:
Oops! We ran into some problems.
Security error occurred. Please press back, refresh the page, and try again.
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Generally, this would indicate to cookie related issues, but is weird if it happens to multiple users at the same time. Imo, is not a big-risk security issue.
Also, if you view a page on multiple devices, it is indeed useful to clear cookies on both eg. phone and pc, you are still using one account which has the same user credentials.
If you want to make sure you clear cookies without any pain (avoid clearing all your chrome data): You can hit F12, click on the tab Application and under Cookies (on the left) right-click and Clear on juventuz.com