IGNORE while I explore further.

Yes, I have quadruple checks and Source Criticism Visual Filter is the only filter turned on.

Right click on the word heavens which is highlighted in blue.
The Context menu shows the source code of P
However, heavens is coded blue for E rather than purple for P.
BUG: If labels are not supported by Visual Filters, they should produce no effect; if they are supported, they should produce correct results.

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Right click on the word heavens which is highlighted in blue.

Right-clicking a word causes it to be "highlighted" in blue.

Is this the effect you are seeing?

Is this the effect you are seeing?

I can't exclude that possibility although it doesn't fit all the odd behavior ... I'll label it watch further.