For some reason the waiver priority doesn't reflect the draft order. I should be 8 but I'm 10. Everyone's is different.
Have no idea why Yahoo did that. I was the only one correctly slotted at "3". Yahoo probably anticipated this problem because it gave this hint in the "Edit Waiver Priority" link:
Helpful Hint: You may want to use this tool to reset the waiver priority order following the draft or to resolve issues caused by transaction errors.
In any case, I changed it to the reverse order of the draft, like usual.