Maybe you got bear fever!! LOL, all joking aside, the elevation, coupled with a field position could possibly have been the problem.
I was in the same scenario last year when I missed 3 bears at relatively short distances,like 225, 350, and 450. The thing is, I was shooting pretty steep downhill on every one of them. I usually only got the 1 shot then they would run back in the brush and would not come out. I know I was over shooting them, but just couldn't compensate the right amount for it. It was a real bummer as 2 of them were pretty big bears...
I figured that it was a combination of the elevation change, the downhill angle, and probly the last factor, ME! I sure get some adrenaline going when I see bears, hard to hold real steady sometimes.
Anyways, I hope you or your other party members got a bear. Oregons getting to dang many! BTW, where was your tag for? I had mine for Weneha. It was a pain in the ass getting around up there. My favorite canyon is still snowed in, the one where I missed 3 last year.