Shelly Dimmer 2 - Warm Up Setting Does Not Save

Hi, I have a number of Shelly Dimmer 2 units, none of them will save a warm up setting. I click save & a pop up message stating setting has been saved.

When I leave the settings menu & return to it, nothing has been saved. This happens on the App & the Shelly Cloud website.

Please help!

I managed to save warm up setting by connecting to the Shelly Dimmer 2 directly through my browser.