Odd Auto Numbering value with cross-references (RESOLVED)

I'm experiencing very odd behaviour with auto numbering when it is used in a cross-reference.

I have an Element (Scene) in Document A that has auto numbering. In Document B, I have a cross-reference to the Scene in Document A. Nothing unusual. I've done this many times before. In both documents, the auto numbering matches, e.g. Document A Scene 10, the cross-reference in Document B shows Scene 10.

However, I'm having some odd behaviour suddenly. When I now cross-reference Scene 10 (in Document A) from Document B, the cross-reference in Document B shows Scene 13. When I double-click on the cross-reference and click on the Go to Source button, it correctly goes to Document A Scene 10. 

Sometimes the numbering is out by 1, other times it 's out by several numbers.

Edit: Nevermind. I had the wrong tag for the Cross-Reference format 🤦‍