I have zero knowledge about how the language patches work or what data you are modifying. I haven't heard of other fan translators encountering this. I don't have any better advice than to start a new project and try to figure out what specific change might have made this happen.
On my end, the position of the talksprites is controlled by 'VisuMZ_2_VNPictureBusts.js' in the 'plugins' folder, so you could try re-downloading a new copy of that from here and replacing it in your plugins folder.