I've had the same with Indian and Chinese parts. They spent more time on the seat from India making it wrong than it would have taken to make it right. I got a tool from China that was about half the price it should have been but it didn't work, it took some machining now its great, I would have paid more for one that worked straight out the box.
I think its cultural, they have no idea what they are making, they just get something and copy it. They don't know what a good standard is, but why should they, they probably live on a bowl of rice ad day and travel to work on a moped.
We had a great example - the paper towel holder in the washroom on an mobile oil rig. The rig was being build in the far East and the shipyard did not want to pay for the US towel holders, they said they could get the same locally. When the rig arrived it had towel holders that looked almost identical but they were made of wood. Really nice carpentry but the wood was 1/2" thick and the external dimensions were correct so the paper towel rolls would not fit. So with it came a huge box of individually cut down rolls of towel.