Strange Properties appearing

I suspect that entries like CentralIndeB1Ref are empty (when created by the arraymap) and despite being void are still created as property reference hence the visibility in Special:Properties.

[0] https://github.com/SemanticMediaWiki/SemanticMediaWiki/issues/1217

James Hong Kong (talk)

That makes sense, thanks MWJames. Replaced the variable x with y and rebuilt data and it's all gone.

Stuarticus (talk)