Maybe it is important, the problem ocurs only with cmis:folder (or childrens of cmis:folder), if i try to do same things with image or document everything works great.
And I think problem is in aspects, because I can't change title and description, but I can change my custom property Folder:status if I create Folder:Folder (it is part of my custom model, child of cmis:folder)
And there is another one strange thing. If I try to do this on the same (but windows) version on alfresco on my local machine everything works great too, but when I try to do this on remote server (linux) I've got this problem.
cm:description is a multi-lingual text property. That means it can have multiple values for different locales. You may be updating / setting the value for one locale via CMIS but in the browser you are looking at a different locale value. You wouldn't even see the values for the other locale(s) in the Node Browser.