Coilover Clunking Noise

So ever since I installed my Tein SA two weeks ago, I have been hearing this weird clunking/poping noise in the rear. It has gotten worse over time and it seems to make the most noise when I am driving slow/turning/and hitting bumps at slow speeds but it will also make noise at higher speeds but not as much. Today I decided to the take whole coil over out and took it all apart. After looking at the coil over, I realized that I was missing a washer at the bottom so i took it off my stock coil overs and made sure everything else was put on perfectly. I then tighten the top bolt as tight as I could using a wrench to hold the top and then used a wrench to tighten the bolt. So everything was put in perfectly and once i took it for a test drive, the noise was still there. I even changed the dampening and that did nothing. Does anyone have any idea what could be causing the noise? What could I do to fix this noise? Let me know. Thank you

P.S. do I need another alignment since I took the coil over out?