Vacations Module problems

Hey there!

So, I've adapted the Vacations module to a specific company and I've changed some bits of the application to suit their needs. However, the manager has recently told me that some vacations are simply disappearing. And neither him or the users are canceling/rejecting the forementioned vacations. Has this happened to any of you? Do you have any idea to where I should start looking?

Thank you in advance!

Best regards,

it never happened so far. I would say to start looking for inconsistent/missing data in the SQL Join queries.