I am finding that you are trying to give passthrough the ONboard USB controller itself instead of the device followed by one of the bus. This will not be working, since ESX needs the onboard controller. You can make passthrough a PCI or PCIe device only.
Now what wonders is me that how you are able to make the usb controller itself as passthrough. this could be a bug with VMware or you have usb-arbitrator stopped, Any case, this could be a serious bug.
While the other device is listed as unknown, I am pretty sure that this is not a device but a bus itself. Can you take a screenshot when you select advanced settings-Edit and the list of devices.