Recently, my computer has been acting quite strangely.
My Minecraft saves list, server list and options menu have become bugged, and now display two different lists when either executed through Steam or not [I have linked Minecraft to Steam as a non-Steam game].
The 6 worlds on the longer list are my standard worlds, and used to load correctly when through Steam-related Minecraft and not. However, after a long while, neither of the Minecraft shortcuts displayed any worlds. I created 2 worlds for me and my friend to play on, as the old ones were seemingly removed [I should note that I can't access my %appdata% file, for some reason]. After about 3 weeks, I went back into Minecraft through Steam. When I looked through the saves, the 6 worlds were back. After that, I launched it regularly and it showed the 2 newer saves.
This doesn't need to be solved, it's completely fine as it is, I'd just like an explanation if there is one.
I cannot think of any reason why this is happening. There are two screenshots if you'd like further detail.