Switch doesn't work

Hi,

I just installed a Shelly 1L (it's my first one) on my kitchen lamp with N and L power.

To the input switch 1 I put a Line Powered wire conneceted to standard on/off switch, I wired dozen of Shelly 1 like this one but with 1L I've got a very strange behavior.

If I choose the "Toggle Switch" this happens:

1. if I switch the lamp on via the Shelly panel the physical switch can turn lamp off after 2 clicks but can't turn it on
2. if the lamp is off the physical switch doesn't do anything.

If I choose the "Edge Switch":

1. if I switch the lamp on via the Shelly panel and then I use the physical switch to turn lamp off Shelly starts to flash indefinitely
2. if the lamp is off the physical switch doesn't do anything.

I tried both "off" and "restore last mode" option but doesn't help.

Anyone can help me?

Thanks

Gekomax