Interesting, when I did mine, one fell out and the other was swinging away like this one. I think somehow the subframe inner flanges moved when over tightened by 1 or 2mm or perhaps the arm had some surface rust attaching it to the subframe.

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BMW X5 E53 3.0 Diesel Sport | Sapphire Black Dakota Beige Leather interior | Year 2004

What I had updated
Carbon Effect Steering Wheel
Panoramic Sunroof Fix
PVC Replacement
All glowplugs and glowplug regulator
New discs and pads all round
All new front suspension links, bushes and rods