Files out of Sync in Webinterface

Hi,

we have a shared folder and two users who access that share. In WebDAV and the Webbrowser the files a different time stamps. Also if one user on the info from the file clicks, he onyl can see his changes. The other user also only his changes. What I miss here? I thought the Webinterface should always kind of online access without any sync etc.

Best Regarss