Can you check the logs to see if anything suspicious is showing up there?
Also, this stackoverflow answer suggests mongo may have been restarted pointing to a different directory for its database files, so that would be another thing to check.
Lastly, I did some searching and found a few mentions of problems that seemed similar to yours related to the version of mongodb being used, so check to see if you're using an older version as well.
At my 30s I found out that there was a developer inside a Political Science Graduated.
I've been COO an CMO for 4 years but I decided to persue my dream and become a Front-end developer:)
Location
Elche, Alicante, Spain
Education
Certificate of Higher Education for Web Applications Development & Degree in Political Science
Can you check the logs to see if anything suspicious is showing up there?
Also, this stackoverflow answer suggests mongo may have been restarted pointing to a different directory for its database files, so that would be another thing to check.
Lastly, I did some searching and found a few mentions of problems that seemed similar to yours related to the version of mongodb being used, so check to see if you're using an older version as well.
I will keep on searching to see if I find those DBs, so strange.
Thanks a lot for your help and effort.