Difficulty applying AIP Auto-labeling and sub-lab

Question

Hello, I am currently having trouble with the auto-labeling and sub-label option in AIP.

1. Does auto-labeling not apply to files that were manually labeled?
   • According to the official website, it is stated that auto-labeling is not applied to files that were manually labeled.
     However, I am experiencing cases where the label of manually labeled files are being auto-labeled if they fit the auto-labeling conditions(ex: including sensitive key words).
     Is this a normal response or is this an error?
     If this is a normal response, then does this means that once a file is manually labeled, auto-labeling will never be applied even though the file contains contents that match auto-labeling conditions(ex: sensitive information)?
2. Does auto-labeling not apply between sub-labels?
   • I have currently made 5 labels including sub-labels:
     1. Public
     2. Confidential
     3. TopSecret
        3-1) TopSecret-Secret(auto-lable)
        3-2) TopSecret-Share
        The issue that I am experiencing is that when a "Public" or "Confidential" labeled files include sensitive information, they are automatically converted to "TopSecret-Secret".
        However, when a file that is labed "TopSecret-Share" include the same sensitive information, auto-labeling is not applied and the file remains "TopSecret-Share".
        Is this because both "TopSecret-Secret" and "TopSecret-Share" share the same parent lable, or is this an error?

I am currently very confused by the present situation.

Can someone give me a clear answer?

Many thanks and best regards!