API don't update clients

Hi,
I have a problem with API.

Info:
Xibo version 3.1.1 on a web server (LAMP on google engine) without docker
Player Version is 3 R307.0
Xmr works, the client is correctly connected and any action made by CMS (layout/campaign change…) is almost instantaneous.

However, if I make a change via API, specifically changing the priority of an event, the CMS updates showing the changed value but the player does not update (never, even at Collect Interval).

EDIT:
the problem should concern the cache: by making changes from CMS the file inside the library/cache/… is updated, but not from the API.
I also noticed that library/cache folders were created both inside the api folder and inside api/authorize.

Can someone help me?

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