For whatever reason (most likely culprits- dirty, trigger spring mis-adjustment, sear mis-adjustment or a combination of these) your sear isn't getting far enough back. If you’re at all mechanically inclined, it's fairly easy to pull the barreled action out of the stock take a look at what's going on mechanically to create the problem. Very likely it's very fixable and very simply fixable.
I've had this occur with aftermarket triggers as well due to a wear/defective issue, but have only seen a Walker trigger do this due to poor adjustments, not wear.
I've had this occur with aftermarket triggers as well due to a wear/defective issue, but have only seen a Walker trigger do this due to poor adjustments, not wear.