Some weird project file transfer behavior

So I have the exact same sample libraries on both my imac and macbook and for some reason, don’t think it happened before C8, but when I save the project to dropbox from the imac and try to open on my laptop, most of audio files are nowhere to be found. I can locate most of em but some weird stuff is happening where the wrong audio clips are being applied to different channels. For example, my perc loop is being replaced with a vocal stab in its place and some of my audio warped loops aren’t aligning anymore. Anyone else have similar issues? Ive put in a few hours on this project and hitting the road for a few weeks and really want to try to finish but this is a causing huge problem. Thanks in advance