How to Fix M3 Clamp on Xhorse Dolphin XP005L?

One Dolphin XP005L user gave feedback that he could not fix Xhorse M3 Clamp. Are there some screws missing? M3-A Clamp is tightened well but M3-B Clamp is not.
m3-a tightened well
can't fix m3-b

Here Xhorsevvdi Tech answers:
We need to install screws before swapping clamps.
1)Remove two screws on M3 Mount
m3 mount screws
m3 mount
m3 clamp
2)Put M3-B Clamp on M3 Mount and install the two screws to fix clamp