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In my case it's not a part number issue. I'm using the datasheet for the part as marked (JN).

(As an extra data point this video also shows the genuine part without the pin 1 spot. https://youtu.be/m6MqNZ7H99w?t=103)

At this point I'd have to say just don't buy AD633's from China, period.

I recently bought an ebay batch of AD633JN that are apparently fake. Applying V+ leads to runaway current and a very hot IC.

The chips themselves looked like this:




Compare to listing pic: (notice the font and numbering is different, the lack of pin-1 dot, etc)



Sounds like you're having the same problem.