Ok, solved. The problem was the license, it was enough to remove the license and then re-insert it. Days ago we bought the extended license and we are putting it in all the sites made with Jevelin, probably some of them had the old license.
Extended licenses have a little bit different activation system than single licenses as a single license gets removed after any website changes, but extended license never gets removed and in some cases it can cause issues.
Let us know if you have any further issues with this as we can try to improve the system. To do that we will just need a website to test.