Edge 530 not detecting all jumps. EG It only detects 4 jumps out of 10 on a trail on my full suspension although it detects all 10 jumps on my hardtail.

I ride a very local loop regularly and it has 10 jumps on it. When i ride it on my Trek Slash full suspension bike it doesn't detect all the jumps but when i ride my hardtail it detects every one. Using the long gps mount as supplied in the Edge 530 sensor kit box on the Full suspension and a stem mount on the hardtail.