It depends on what condition the edge was when you honed on the 12K. The 12K is a great finishing or touch-up stone for maintenance. But maintenance is not repair.

We change the oil in our cars for maintenance, but once your motor starts to knock, changing the oil is not going to do much to make it run better.

So were you doing maintenance or repair? Can you re-hone( touch-up) on a 12k? Sure, but that is nothing like maintenance.

What is the current condition of your edge?

Look straight down on your edge with magnification and a strong light. Any shinny reflections are spots where the bevels are not meeting in a straight edge. Any shinny spots will have to be honed until the bevels meet, many laps on the 12K or fewer on a lower grit stone depending on the size of the shinny spots.

Or it could be honing technique, or most probably your stropping technique.

Stropping ruins more edges with novice honers, because it only takes one errant lap, lifting the spine before the razor stops moving to damage the edge. A keen razor edge is a very fragile thing.
A pasted strop is even more unforgiving that plain leather.

Before you do anything else that may further damage the edge, examine the edge to find out what it needs.