Stuttery Archival Footage

I have a historical doc I'm cutting and we've begun to license archival footage. The majority of it is 29.97 and our timeline is 23.98. For the most part the footage looks good, but sometimes when I cut it in it looks stuttery and exports the same way. But it plays fine when I watch the files in the source monitor and in Quicktime. When I go frame by frame in my timeline it seems that every frame is duplicated. I'm attaching the specs of the footage and the specs of our timeline. I'm guessing I need to convert this footage in some ways but curious if anyone has experienced this before.