Triac never switch off
I always measure 220v. Why?


Your measurement meter has an input impedance of around 10 Mohms and the leakage of the triac might be equivalent to 100 kohm so, this means you'll see about 99% of the AC voltage on your meter when the triac is deactivated.

But, you also have a snubber that conducts electricity and that has an impedance of around 32 kohm at 50 Hz. Do the math.


  Why?


Your why question doesn't really constitute a sensible question. For example: -

At this moment a smartphone charger was plugged in J2. Why?


Not sensible to ask.

I was unable to see exactly where. Why?


Not sensible to ask.

Do you see what I mean?