so backtrack a mo
your 12611 had LDVs of 3 and 2 respectively.
Did you change these both by one to get 4 and 3?
So now 13146 has been flashed, the LDV for 6BL has jumped from 3 to 5?
These values should only go up by one per update, so you've done something else in the meantime.
Do a google for changing LDVs on a 360 NAND. I'm off out now, but I think you can change both values to the highest number (i.e both 5) and it should sort it.