You forgot to put the NSFW warning for the video lol.
Edit: Joking aside, it appears that only the cosmetic shiny ring (that looks like metal) is moving while the outer plastic cylinder is static. I don't have any devices with this type of jack, but this leads me to believe that the jack is securely attached to the PCB and is not moving. It appears that there is some play within the construction of connector itself which may be normal.
Haha yes.
Yeah I had a real close look now at the jack port and not even the shiny ring is moving.
The only that moves is the actual 6.35mm plug of the headphone.
Seems like it doesn't go all the away in and there is like a 0.5-0.7mm gap between the shiny ring and the plug's hilt (no sure what else to call it lol) so there is still a tiny bit more left of the plug that can be pushed inside which gets gets push out by the metal strip inside the port.
The same thing with the included 3.5mm to 6.35mm adapter plug.
So it doesn't look like the 6.35mm port itself is moving but looked like it was due to the shadow from the plug being moved in caused the shiny ring on the port to appear as if it was moving but only the plug it self it moving in a bit when pushed.
It seems that the port is securely attached to the PCB and thus no defect I think.
Oh the jack itself didn't move. That seems fine to me.
Yeah should be fine I think and no need to for my L30 to be replaced.
Thanks everyone for helping me out.