Preface: I've read most (if not all) of the posts about this and I'm comfortable with what is going on...except that I haven't found an account with what is happening on my system.

When I run LDIFDE export I find three entries of concern:
(entries below have been abbreviated to save space)

1st: spn=mssqlsvc/computername...:1983
2nd: spn=mssqlsvc/servername...:1433
3rd: spn=mssqlsvc/servername...:1433

The 2nd and 3rd are identical, and both are different from the 1st.

What am I supposed to remove here?

Do I need to be concerned with the duplicate entries?