Hello, you could remove the lian li strimer plus cable and connect the original cable direct to the graphic card if the problem persist so it is not the lian li cable it could be the power supply original cable or it could be the graphic card

I'm still waiting for my hub then I can build to the Strimer Plus V2 that comes in the rtx 4090 geschtekt then only come the original cable where then go into the power supply and yes it should not be too much bent

Edit: 3 last line: It really is up to the hilt*