Closed Captions being cut off in Premier Pro

First off, I *do not* need nor want subtitles.  I *need* closed captions.  Premier Pro is truncating my closed captions on export. Premiere Pro is fully updated. I am creating these captions for a broadcasting network, but too often the export doesn't match what is in the edit. We are talking about trancated captions and also timing of captions that have been altered on export. I am create captions for both lines (608 & 708) but this issue only seems to be happening with 608. Just FYI, My methodology after export is to pull the file back into Premiere to make sure everything is good. This is how I have caught the problem (but the network has also caught on their end with their servers.

I have tried many trouble shoots/ work-arounds (including just exporting the 608 line, and importing an scc I crreated from the project in Premiere), but the issue remains.

Here is how it looks post edit (where all the captions are back to back wih no spaces):

And this is what it looks like post export (with spaces and timing shifted and some caps coming in late or ending early):

These are my export sttings (HDCAM MXF):

Any help would be very appreciated. Thanks.

Firstly, are you 100% sure you need CA-708 closed captions? Youtube supports other formats. such as SRT which I don't believe have length restrictions.

Otherwise, you're only option is to cram the text in and cut to the next caption again and again whilst the person is speaking.