The data on screen looks wrong

Step upstream through the pipeline to find where a value diverges.

The renderer

• Open the production's control panel → the layer's preview. Is the wrong value already there?
• Yes → the issue is in the dataset (next step).
• No, but live is wrong → reload the renderer. It may be stuck on a stale state.

The dataset

• Open the dataset page.
• Find the row the layer is currently showing.
• Is the value correct in the dataset?
• Yes → the template binding is wrong. Open the template and check the object's data binding.
• No → the issue is in the mapping (next step).

The mapping

• Open the mapping.
• Look at the preview.
• Does the value come out wrong there?
• Yes → the mapping's logic is off (wrong column picked, wrong constant, broken computation).
• No, the preview is right but the dataset is stale → Refresh the dataset, or wait for the next scheduled refresh.

The data source

• If the mapping looks right but still produces nonsense, open the data source itself.
• Is the raw value correct there?
• No → re-upload (Excel/CSV), re-type (manual), or refresh (plugin).

Three layers of "is it correct here?" catches almost every real bug.