The WearRing_CaseClearance field is shown like this -
topmostSubform.Page2.Span.P.WearRing_CaseClearance - in Designer.
I found an odd but working solution.
It seems when I converted the Word Document to a PDF, it made each section in my form a span block. Adobe seems to treat span blocks as subforms. So when I right-click (in the hierarchy tab), the span tags, an option of "unwrap subform" is available. Unwrapping all the subforms/spans allowed my fields to see each other regardless of which span block they were in.