That's not weird for the SM damper, they're all like that. At TDC, The first mart lines up with the "T", and the other one is off the scale. People seem to confuse this with when they're checking with a timing light, locking timing at 10*, and seeing one at "10" and now the 2nd mark at "T".

Just to reiterate:

TDC (for mechanical timing): marks at T and -10 (off scale to right)

10* (with a timing light for sync): marks at 10 and T

I'll try to get some photos of that to clarify later. Hopefully I wasn't the one who led you wrong.

 

Oem should have had a single mark, imo. I've also seen this more than once.