1995 land rover discovery

I have a 1995 Land Rover Discovery and didnt have any remotes when I bought it so I decided to use an aftermarket keyless entry system in conjunction with my pre-existing factory alarm.  I have used some information gathered from this site and created the diagram of my current install below.  The problem I am having is that only once in a while the alarm arms when I lock the door and sometimes it doesnt do anything at all.  The locking and unlocking of the doors work flawlessly , any help would be greatly appreciated.

Thanks

Door locks work fine, it is not arming and disarming properly.

This is exactly what happens.  I will lock the keyless entry and the doors will lock, it is 50/50 that the factory alarm will arm and if it didnt arm when I hit the lock button the first time I can unlock it and lock it again and it almost always arms the factory alarm.  When I go to unlock the the keyless system it always disarms the factory alarm unless of course it is not armed.

When I tested the blue wire connected to the microswitch at the key when you unlock it the system throws a ground and does the same when you lock with the key.