Hi,
Thanks for the response.
Firstly I only have 3 arrangements (Lead, Rhythm and Bass) so it's not the 5 arrangements issue.
I downloaded Rocksniffer to have a look at what was happening. I don't know if I was looking in the right place but I was using debug_addon.html to see what was happening and it looks... fine to me for the most part? I did two attempts at this, one on the tuning screen, and one after relaunching the game and playing a few other songs in the right tuning to jump straight into the song from the song select screen, and I noticed it changed the game stage in the two .txt files that I copied everything from the html file into (which feels like it makes sense). However the arrangement ID on the line above the game stage also changed, which is probably the biggest thing I found odd. It also removed the names I gave my phrases in EOF and replaced them with things like "p0 15", etc., and I'm not sure what caused that.
I'm not sure if there's anything else that I'm not picking up quite yet since I'm not sure what I'm supposed to be looking for. I've included a Google Drive link to the .txt files if anyone wants to have a look to see what else might be going wrong. Also do let me know if there was a different html file I needed to be looking at in Rocksniffer too.
https://drive.google.com/drive/folders/1dOeSzM2HQdvKfYIoqsvLtNj448WLeKEo?usp=sharing
Thanks