Custom script cannot be saved in Glue

I am trying to combined 2 sources and added repartition(1) for a single output file in csv, the script worked until today and when I go back to check the script, it seems like Glue deleted repartition(1) part and connected automatically from Union. I added the repartition code back in and saved, but it still can't be save and resulting with 2 outputs instead of 1. Same thing happening when I try to create a new glue job.