Hi Mat, that looks like problems in trim boundaries in the import. Different CAD programs can represent trim boundaries in slightly different ways and so there needs to be some processing of them during CAD file translation. Some of the processing can be sensitive to things like badly formed surfaces or some kinds of edges on closed surfaces. So sometimes there needs to be some repair done on the imported geometry.

It's hard to give a recommendation just from looking at a screenshot, is it possible for you to send me the file at moi@moi3.com? If it is large you will probably need to use a file sharing service like Dropbox/One Drive/etc... and send a link to it.

- Michael