Sometimes it just ignores movements and starts triggering the alarm only at very specific angle of the device.
The shock sensor does not use high-pass filter and must be mounted exactly vertically. The behaviour when you tilt the node and it triggers alarm is correct.
In that video with a coin I’m quite sure that I set the sensitivity much lower in the code.You have to tune the values.
Initially I set the sensitivity to the level, that the change of the pressure in the house caused tiny movement of the closed door and triggered the detection.