I can understand how this happens, but with commentaries that don't cover every verse of the Bible, they shouldn't appear when they don't cover the verse (or range) from the guide. In the screenshot, I've highlighted in green what is the expected/desired behavior and in red what is the buggy behavior. In the textual commentaries sub-section of the textual variants section, it behaves as expected.
Note of clarification: This is not only true of textual commentaries, it occurs across the board as far as I can tell.
