I fonund 2 log files in AppData\Roaming\Factorio. I am not sure these are correct ones but I am attaching them for you to examine.

https://i.imgur.com/rGPFzfu.png

I tried to deconstruct some old buildings and found out 33M of legendary P3 modules stucked into one EM plant.
I don't know how this happened and I checked my save files. It looks like this happend at least 1~2 month before, many of previous saves also contains ...