OneNote Gem Add-Ins

Question：

I'm preparing an exam and have been taking notes on OneNote on my desktop PC and having it open on my surface for inking when needed.
 
About an hour ago i get a notification from windows saying that my SSD is full , I thought this was weird because , even though my SSD is only 128 GB , I only have very few apps installed and have around 60GB of free storage at all times.
 
I check and sure enough C: is filled to the brim, I start checking proprieties of the files folders until I find the path that lead me to the culprit.
 
C:\Users\%username%\Appdata\Local\Packages\Microsoft.Office.OneNote_XXXX\
LocalState\AppData\Local\OneNote\16.0\cache\tmp
 
This tmp folder is filled with .bin files and using 61GB of my storage, since it's a temporary folder I close OneNote and turn off the laptop, the laptop reboots and the issue is still there.
 
I decide to delete the files inside tmp and by doing so OneNote resets and re downloads my notebook, fast forward to 20 minutes later and the tmp file is back at 14 GB and growing.
 
Now, i only have 3 notebooks , 2 of them have only one page , and the one I'm using to study probably has 20-30 something pages of work , there is no way they the files are actually that big but I don't know how to stop this.
 
Since the exam is pretty close I'm considering taking OneNote out of my workflow for the time being but sooner or later I'm going to need it again.
 
I'll take all the advice I could get, thank you in advance
 
Edit: my theory is that having OneNote open when working on another pc when syncing (which happens every few words letters I type on my PC) is downloading the full notebook every time without deleting the previous file , if someone knows how OneNote syncing works that would be great, it's really annoying to have to delete this file every few hours
 

Answer:

 
Not sure, but I suspect that OneNote is continuously generating a lot of conflict pages and that increases the file size.
 
Does any page say that it has conflicts? (A page with conflicts would have an exclamation icon in the page list and a yellow info bar on the top of the canvas).
 
If so, then copying the contents of that page into a new page and deleting that page might help.
 
If not, try copying the contents of this notebook into a new notebook and see if it fixes the problem.