Hello @macombptac ,
It looks like a known issue that sporadically occurs with LinkedIn that our engineers are looking into. I've submitted your case with your screencaps to them for further review. If and when they have an update regarding the issue, they'll make sure to notify you.
Unfortunately the only workaround in the meantime would be to manually edit the LI social share post to include the wording, or to just post directly within LI with the wording and link to the campaign.