Replay selection screen problem

Up until recently, I had many replays on display there, about 10 or more. I could scroll through a few of them.
Now recently, suddenly every time I go to the replay gallery says that message

"gallery is full, eliminate old media to get new media" or something like that, that many of you might now about.

The problem is, some of the replays that I wanted to delete are probably the ones who are right now invisible to me. I didn't change anything on the data inside the documents folder to prompt this change.

I wonder, what did I do? did I instal any .dll on some windows update, is there anything that could've messed this up and how?

Specially with the necessity of reviewing my own LFM multiplayer races either to see what I did wrong or what others did wrong or if anyone purposefully crashes into me and I need to report, this is a pretty serious setting and without replays to report I can become hostage to crashers, making AMS 2 LFM unplayable.

I've also wondered before and even asked in the forum or feature request if there would ever be possible to backup the replays or rename them in another folder to catalogue them, but I have never actually done anything on the PC for this to change and now I'm not able to access to 70% of my replays that I had previously.

 

Thanks, I've done that and by selecting small groups of files I can see replays by date.

I've also noticed a lot of small files (maybe related to screenshots?) that sit there, but I believe do nothing.
I didn't find any screenshot option in the game to see those shots in game.
The difference in size from the files is quite big.
What do those small files do? Can I just erase them?
they have no importance to anything else in the game?

Thanks