Fibaro dimmer 2 setup problems

hi ive installed a fibaro dimmer module 2 on a one way lighting circuit , the bulb is a cfl under 25watts , i did the device handler code no probs and everything setup ok , So when i use the st app to turn off the lights the bulbs flashes constantly and when i try to use the actual light switch all it does is bring the dimmer range from 1 to 99 or whatever last setting was .

All i want it simple on/off functionality at the minute

Robin thanks a million for all your help , I bought a momentary switch this morning and changed parameter 20 to 0 also I ordered a by pass module as the 9watt bulb is flickering in the off position , thanks again robin

Weirdly I don’t have a parameter 31