“Why does it tell me I have 7649 Video and 7649 Audio as 2 separate clips? It does not show that on the other 2 cameras”
look at the clips in the timeline.
2 have their names underlined, this indicates the picture and sound are LINKED
one is not underlined: it’s picture and sound are not linked, they behave as separate entities.
select that clip’s picture and sound and hit Command L to link them
“When the box comes up I set it to start at In Points”
that’s why your clips are out of sync.
dragging what you have in your timeline into the browser, those clips in-point’s are all the very start of the clip,
yet that is clearly not the sync point for the clips.
go to a point in the timeline where ALL clips exist. the start of the latest clip would be good, but not essential.
BLADE ALL THE CLIPS AT THE SAME POINT
to do that summon the blade tool (b)
hold Shift, making into the Blade-All tool,
and click.
the blade point is a sync point for all 4 clips.
copy all 4 clips from this blade point , and paste into the browser.
the in-point of these browser clips will now be common.
make a Multiclip, and sync by In-point.
nick