The clips in my sequence are changed

Lately when I open a project I've been working on, most of the sequences are completely changed. Every single clip is replaced for some random fragment of the sequence. Aparently the clips are correct but once I start playing it, is the same clip over and over. I've tried resetting everything and also downloading an older version, but the clips are still changed. Sometimes when I look for the auto saved projects they're alright, but not in every case. Anyone is in the same situation and knows how to fix this? Thanks.