Don't bother with the immunity setting at this stage,set all sensor pulse width jumpers to position 1,(pet immunity off),replace covers then do a walk test as gts has said.
If the panel does register all zones on walk test then check the zone attributes in programming,ensuring it hasn't been programmed for double knock.
You still haven't answered gts's question: "did it work ok before you changed the sensors", or words to that affect.
Use the add answer form below,less confusing if one sticks to one post.
e manno
September 2013