Apologies for the triple posting (I can’t work out how to edit original posts here), but I found the solution to the question of turning off instant formatting (clicking on the corner arrow to open the bibliography tool tab in word, then going to the formatting tab).
Now it is just the weirdness about the missing reference: I’ve added another 30 manually since the last post, and it is doing this to several, always selectively too (the other references either side will be happy and complete). Coldstream in particular disappears consistently?