Encore purposely lagging subtitles?

[house3272]

I've been using Encore for a while now, never done anything with subtitles though. In the foreseeable future, I probably will have to deal with them often.

I brought in a video using Premiere and Dynamic link, then the subtitles through Encore. The video and audio are synced correctly.
Now there's a spot around 02:03:20:00 where the last subtitle shows up.
The specific text from the original video, ripped mkv, along with audio and video confirmation from the converted mp4, and inside both Encore and Premiere, all agree that it should be 02:03:18:08 to 02:03:22:08.
However, in Encore, this changed to 02;03;25;20 - 02;03;29;20. (yes, I selected 'absolute')
Upon exporting it, Encore shot out a different version with all the subs progressively lagging.

Also, why did encore change the notation to semicolons?

Thanks!