CSS326-24G-2S+ switch SwOS 2.18 VLANs page show empty, but instead there are 2 VLANs

On this (recently installed) switch i added 2 VLANs, of course i’ve applied/saved changes.

Now if i enter the web panel, the VLANs page show empty, but it’s not true.
The 2 VLANs are still there and they work perfectly.
Maybe there is a bug in the firmware about the VLANs page.
I also rebooted the switch n times, but the page still show empty..

The firmware is up to date (2.18).

Any help?
Thanks.

massimo