Save Location Changed Without Explanation

For over 700 hours of gameplay, my save location has been at the normal location of “C:\Users\Name\Documents\My Games\Borderlands 2\WillowGame\SaveData”. I launched the game this morning to find it had loaded the game’s default settings and no characters. I navigated the the location I just mentioned, and all of my save files were still there.

Upon investigation, I found that it was now saving/loading to “D:\Steam\steamapps\common\Borderlands 2\Binaries\Win32\€\My Games\Borderlands 2\WillowGame\SaveData”. Notice the odd folder name between “Win32” and “My Games”.

I have completely reinstalled and deleted all settings files. How to I get the game to start loading from the correct location again?