Ah, OK, this UI vs data question also boils down to the discrepancy between direct and indirect evidence. Direct evidence is when the source explicitly tells target x is linked to breast cancer. However, we can take advantage of the disease ontology and we can infer that target x is also linked to cancer (as being an ancestor of breast cancer), this is what we called indirect evidence.
By default the evidence widgets show indirect evidence. Please go the cited platform page, find the expression_atlas widget, click on API Query button in the top-right corner. This will show you the actual graphql query that fetches the data for the widget. You’ll see the enableIndirect: true option. Switch it to false and you’ll get only direct evidence which will be consistent with the downloadable data.
This is a recurring issue that causes confusion (see here, here and here), we are currently working on a suitable resolution to ensure the association page and the content of the widget is consistent.