Anybody else getting Usb2.0 Speeds on Usbc ports?

Ok I'm having this weird issue when I connect more than 2 external drives on z13 (2022) I'm getting USB 2.0 speeds.

Right now I got an nvme 970 Evo plus with a 40gbpw thunderbolt case on the thurbolt port with a thunderbolt cable (crystal mark gives me (3000mb read and 1000write) and on the other port I got a WD passport which usually gives me like 100-130 read/write.

Now I get them connected and Im copying some folders from one to the other and I'm getting like 30mb/s speeds.

That happens every time I. Connecting more than one external drive so what's the deal here guys.....