Reminds me of a story of a printer I installed for a customer (could have been Lexmark? It was a very cheap printer). It came with an unpowered USB hub which I thought was odd. The printer was not printing right. I happened to read the instructions for once out of frustration and it mentioned that you MUST use the USB hub. That didn't make any sense as usually a troubleshooting step is to remove the USB hub. But when I put the hub into the chain, the printer started working correctly. I wish I still had the model number to prove it, but there were knowledgebase articles about the hub being required. Probably to correct some mistake in manufacturing where it was cheaper to include the hub than fix all the printers.