Inconsistent "Swing" designation. Plays sometimes as straight.

I'm using the "Swing" text command, which works 98% of the time to make the song swing, but I can't understand why it's not working the other 2% of the time. In that 2% that's not working, it's playing some notes as swing and others as straight.

As a related aside: I remember the olden days of WordPerfect for DOS word processor. You could turn on "Reveal Codes" which was like lifting the curtain to see how the codes were being used underneath the presentaion. This let you fix underlying problems. Would something like this be helpful to MS? I imagine being able to turn on Reveal Codes and seeing some extraneous code in these sections that is causing the "Swing" command to be ignored. One could edit in that mode and fix problems. In other MS threads where people had problems they solved it by looking inside the musicxml file itself. This is sort of reveal codes functionality, without it being built in. I'll leave it to others to determine if this is a good idea to make it part of the program. But as MS gets more complex to handle the true complexity of music, it might be good to be able to dip into the underlying XML to sort out problems. Maybe not.

Anyway... Excerpt attached. Notice everything is fine until measure 4, and the three eighth notes revert to Straight. I thought maybe the marcatos where the problem, but after removing them the problem remains.

In another section of this song, some instruments play Swing and others play Straight at the same time. Sounds pretty rough.

Thanks.