When importing captions via an .srt file, the dimensions are incorrectly swapped by Premiere. (For example, I export a .srt file from another application at 3840x2160 pixels, but it imports into premiere as 2160x3840px and has to be manually interpreted in order to be corrected
We have completely redesigned the captioning workflow in Premiere Pro version 15.0. You will see this feature as well as many other dramatic workflow improvements. Please update to the latest version.
Learn all about the new captions workflow here: https://helpx.adobe.com/premiere-pro/user-guide.html/premiere-pro/using/working-with-captions.ug.html