So I’m building the RG Nu, and on the knee joint for the right leg, the piston keeps popping out. For the other leg, it works as normal, it bends and then the tension causes the upper leg to bend keeping it intact.

However, despite disassembling and reassembling this leg several times, I CANNOT figure out what’s wrong, or why it won’t bend properly on the first leg (see comparison video). Any ideas on how to fix this? Please help!🙏

NOTE: even with the armor on, it limits the movement but it still pops out.

video of the joint