I have a rather large file. Running Solidworks Professional 2021 SP2.0

I'm looking to add .010" to all sides and tops of about 200 rectangles. I chose all of them and exported a parasolid. 

I had a coworker tell me that some of the faces don't have the stock (they imported into Mastercam)

I looked back and I had chosen all the correct faces, but now the function had dropped over 100 faces I had chosen.

I went back in and opened the Move Face2 and there were 884 chosen faces. I added four for a test (885, 886, 887, and 888) and then when I rebuilt and opened back up, there was only 882 chosen faces. 

Has anyone had this happen? And if so, how did they fix it.