Emulator

Hello, I recently downloaded dolphin.exe, I played multiple times without any problem.

However, my Wii (isos) saves are getting deleted (or at least, lost) and I don't know why. It might be because of something in the settings (like my folders or smth) but I don't find the reason. My saves got deleted twice, the first time, it wasn't that important but the 2nd time, it is important for me cause I played way more time.

I wonder why they keep getting deleted if I don't play everyday, and I also wonder if I can get my old files again ? (I guess not if not exported but idk)

I don't know if it is useful but the games I played were PES 2011, MKWII, Mario Strikers.. (the 1st time), and PES 2011 again (the 2nd time) + I created Miis.
I first did an online update in France (my country) then in the USA (2nd time).

The version I currently have is : Dolphin 5.0-15445

So, if someone has any advice, link, it would be mega kind and I would be thankful ! Thank you in advance, take care of you !