It seems that I have or the system has somehow created multiple accounts. Although having both cast and crew credits might explain two accounts it would not explain 4 that I find so far.
If this is about multiple IMDb name pages with the same exact name but different roman numerals to the right of each name, you can submit a request to merge three of the four pages. Instructions are on the link page below:
Thomas Mark Higgins (II) Thomas Mark Higgins (III) Thomas Mark Higgins (IV)
On each update submission, type the name this way:
Higgins, Thomas Mark (I)
Also, provide a brief statement why the pages are being merged. For example, "Same person on both pages." You can also provide the URL of this page as proof.
Since it looks like there is no other page with that similar name, after each submission has been approved, the roman numeral should drop off.
Depending on any backlogs, each submission will take at least 48-72 hours for processing.
I hope this helps. Please write back if you have any more questions.