Why might a filter control not affect a chart?

A control only affects charts whose data source contains the control's field. If one chart uses a blend or a different source that lacks that dimension, the control silently passes it by.

The other common case is a chart with its own filter or date range set in Setup, which takes precedence over page-level controls.

Both fail quietly rather than erroring, which is why checking a report in view mode before sharing is worth the minute it takes.