Glad you found the issue. I've made similar mistakes and it could have easily cost me my life.
My first bike was an r6. I rode the tires off it, and had them replaced. In ignorance, I was un aware of the slight variance in width of the two rear axel spacers. I installed them incorrectly on opposite sides. And didn't know it until I had severe tire wobble at 80 mph 3ft from a semi on I-435 here in KC. The chain popped and flew off into the nearby guardrail, as I coast to a shaking stop. After a sober prayer, I vowed to never wrench on another bike without vastly researching the procedure prior.