Odd Valve Clearance?

[ejether]

Hey all, I just got another seca and I'm really excited about it.
When I got it home, I cleaned the carbs, threw in a battery and started it up.
It was clearly running like it had a vacuum leak. All the boots looked good so I check the valves and they were all about 1/2 of what they should be.

The PO had written him/herself notes on the frame but they don't match reality
All the valves were adjusted much closer to the range written on the frame though.

Untitled by ejether, on Flickr

Question is before I get a bunch of shims and adjust it back to spec, is there any reason anyone know of why the PO would have written:
IN:4-6
EX:8-10

Thanks!