The screw and nut are numbered 3 and 4 but the bubble comes out with the same number 3 for the 2 pieces This does it to me in automatic and manual bubbles. Do you have any idea where this can come from?
I'll take a look at the configs... There are the options " Show configurations with the same name under a single article number", etc. which can give this result.
Are your balloon numbers different with a different view? (To be tested) Is your screw+nut a sub-assembly? I imagine that the arrow of the bubble is ... Take a screenshot of the characteristics (properties) of your BOM. Is the phenomenon reproduced if you " group" your exploded party?