This is an issue concerning the VRChat official website:

When requesting a DMCA removal and submitting over 100 content IDs in a single request, content IDs beyond the 101st item may occasionally fail to process.

(The first 100 items are processed normally.)

This is the second occurrence of this issue, and it has been reproducible.

Since DMCA submissions are made under penalty of perjury, I cannot personally verify this bug.

Even if the issue occurs, resubmitting resolves it, so the severity is not high.

If the cause cannot be identified, limiting the number of items submitted at once to 100 might be advisable.