Extremely shaky and jittery video export

Adobe I've been using the same export settings (H.264 and Match Source - High bitrate) for tons of videos for about a year.  I recently started using one project bin and creating different sequences out of the same video files in the project. I started running into an issue where once I export a sequence, the video would be jittery and shaky, especially for files that were sped up and warp stabilized.  I went back to creating new project files for each sequence I made instead of sharing a project bin for several sequences.  Now, even those exports are jittery and shaky.  I can't find where the issue lies in my export settings.  I'd really appreciate it if anyone can help me understand where the issue lies as soon as possible as this is the main program I use for work.