2 uneven pages left right 16, 17 in a document of 64 pages in spread of same double master page spread.

only 2 in whole doc.

mac os x mojave 10.14.6 indesign cc 16.01 (adobe rep told me this is the only version that works w/mojave and my late 2015 imac 5k)
i finally resolved by adding 2 new blank pages ahead of those 2, (applied master), copy pasting the content to those 2 new pages (singe spread), then deleting the original wonky pages.

I didn't want to take a chance the spread was transmitted wrong to the printer even thought it was probably only a visual glitch/bug.