Hi Samantha,
I do not know of a reason for the form id and folder id to have changed outside of significant events in managing content in your ArcGIS Online account (completely republishing the form, moving from one folder to another, deleting and recreating the form).
To update, go to the following folder in your computer (have Survey123 Connect closed):
C:\Users\<username>\ArcGIS\My Survey Designs\<Name of the Survey>
Inside the folder will be a file with the extension .iteminfo. Open that file with Notepad or another text editor. You will need to update the following values:
- id: gets the new item id
- ownerfolder: gets the new folder id