Explorer Engine Assembly Rod Bearings

Well I am assembling the engine finally and i got all the pistons in.
I didn't torque the rods yet, I just turned the nuts snug with the wrench
When I got to the last one, #8, turns out I put #8 in the #3 hole so I had to remove #8.
When I did I saw a surprise, the streaks seen below on the new bearings.
I tried using my finger nail to see if I could feel it, and I think it did, barely.
Maybe because it was in the wrong hole? Not sure why that would matter but I figured i would put it to the test.
Well I put #3 there in #3 and tightened it snug, not torqued.
put #8 where it belonged. rotated the assembly about 10 times, then poped off the cap to #3.
There were now streaks there as well.
Could this be because I didn't torque the caps down before I rotated it?
Could it be the machine shop didn't sand+polish the oil galleys properly?
and yes the crank and everything was clean there's no sand or grit that would have caused this as far as I could see, I have been pretty careful.

Beside what it could be do I need to replace these bearings again? Not a huge deal but pisses me off pretty good.

thanks guys

Maybe I nicked the crank installing the piston.. gotta check it out.

Yea I used the assembly lube.
I just poped off #3 again and used my fingers all over the crank, I don't feel anything that could of caused it, the oil galley has a rough edge but I have no way of telling if it's below the surface as it should be or if it's making contact. I guess it is possible that it had some grit but I have been real careful.. I still have to drop off my heads so I may just bring the whole damn thing down and have them look at it.
I also poped off another rod cap and it looks fine.

So I pulled off some rod caps, all were scratched and I puled off one main cap and it is scratched as well.