[Inf-IT DAVcl] Update to 0.13.1 seems to fail

I have overinstalled Caldavzap 0.13.1 (my files are dates sept 22 15:30) on a (nice) no config davical/caldavzap installation. And all seems to work except I still have the message inviting to install "0.13.1 (you have0.12.1)". I have restarted nginx, chash_update.sh.... What do I miss...? Thnak you PC