Recently managed to install BG 1 + 2 from GoG along with the "Recommended" setup of BiG World, which went flawlessly after Gibberlings 3 came back up. Everything is working beautifully so far (one of the quests in the starting inn in Baldur's Gate 1 is in German, but that's quite alright), but as soon as I went to talk to Jondalar (the fighting trainer) in Candlekeep, the following lines appeared instead of his usual conversation text:

Now it seems to be taking text from some other part of the game and inserting it into what is supposed to be his speech. This isn't in itself a major issue, but am I going to run into more problems like these down the line, and if so, how severe is it going to be? It's alright if I miss out on "tutorial" text, not so much for story-relevant lines that may become swapped in a similar fashion.
Thanks in advance for any helpful suggestions or insights

Edit: Attached my weidu.log in case it may be helpful.