Project & Task linkup issue (may be bug)

Hello there!

We use ERPNext 9.1.1 and seems like some issue in projects and task linkup. Outlining steps to reproduce the issue:

When we create a task AA within a project A and save the project A, that task AA links up to previous used project B. Means - lets say before creating the above task AA, we logged a timesheet against task BB in project B.