Mine has same thing. And I get alignment frequently from Sear through best Hunter Machine. We eliminated its the rear arm the big piece which im not gng to replace it anytime soon. Lol. But advice is change the arms 3pc. Ball joints, upper arms, lower arms,

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Past
2000 E46 325i
2006 E53 4.4i Sport
2006 X5 4.8is
2011 E90 328xi
2011 E71 50i Fully Loaded :thumb up:
Current
2000 E39 528i
2013 F10 M5
2013 F10 535xi
2017 X3
2017 Sedona
2017 Optima
2016 Fiesta