EDIT: This bug occurs for any build for any frame selected from the builds list, including Ash, Ash Prime, and Valkyr (all of whose ability damage is affected by Steel Charge). This appears to be a bug connected to Coaction Drift and pre-builds.
There's a bug on a specific Ash build, the #2 ranked build in the builds list. If you add Coaction Drift, it won't add any damage to Ash's Blade Storm, and when you remove it, it decreases the damage permanently; the only way to restore it is to refresh the page.
On the build page, you can add and remove Coaction repeatedly until you eventually reduce Blade Storm's damage to a negative number (a Blade Storm that heals the enemy). I recreated the build on a new Ash page; when I added Coaction Drift, it added damage properly (about +500).