How do I remove enhancment chance?

[Mörkö]

It seems to have gotten stuck and I can't tune it down.

Is this maybe a glitch?

[Proctor Cain]

Here's a link to what is effectively the game manual entry for enhancement.

https://www.naeu.playblackdesert.com/en-US/Wiki?wikiNo=48#6.2

Have a look under para.s 6.1 and 6.2.

There is also the old school method of maintaining fail stacks on your alts.