API don't update clients

I have a problem with API.

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).

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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