seen this one with dataflow builds. the geometry collection asset holds the per level thresholds, but the component caches them when it is created, so editing the asset after the component exists leaves the component showing defaults.
fix: set the thresholds on the collection asset first, then either recreate the component or push them at runtime with the set damage threshold node per cluster level, and save the asset so the values stick. with dataflow, re-execute the graph after changing thresholds or the generated collection keeps the old ones.
also check you are editing the right cluster level, level 0 vs bone level thresholds look identical in the ui but only the matching one moves the needle.