I'm beginning to teach Scratch a group of teenagers and yesterday we had about 19 projects in the account, but today I have a look and I have found only 3. Can anyone help to unerstand what happens?
Because I'm really worried about this matter because next week I have to do another lessons with the last projects made.

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If all the students are sharing the same account, any one of them may have put them in the trash area. I see a large number of projects in that area. You can move them out of the trash area and back into the regular area using your mystuff folder.

I’d suggest creating a Teacher Account and then creating accounts for each of your students to prevent this from happening again. Using the Teacher accounts on Scratch make it much easier to track individual student’s progress and prevents them from deleting your’s and other classmate’s projects.