I have an "album" I created with hundreds of songs. I do this so I can use a random play. In MP3Tag I see the numbers sequentially, no repeats. When I look at the folder in WIN11 File Explorer I see duplicate tracks and the track number doesn't always match the one in File Explorer. It doesn't seem to affect playback but it's odd that the track numbers displayed don't always match.
It's a WIndows Explorer problem, not an MP3tag problem:
Workaround: do not use 3-digit-numbers with leading zeros as Windows Explorer interprets these as octal (and not decimal) values
Microsoft know this since - at least - 13 years and "Windows 7"
https://answers.microsoft.com/en-us/windows/forum/all/mp3-tags-specifically-the-tags-are-not-correct/625737c9-8497-443b-a2a7-3d7b02e513e2
and Microsoft was not able to fix it since then, including "Windows 11".
Wow, that old, huh? Well, good to know. It does seem weird that you see different track numbers depending on which tool you use to access them. They must be writing to 2 different places in the metadata.
Thanks for the quick response.
Nope.
It is how the Windows Explorer interprets the data in the field TRACK - and then it sorts the files accordingly.
you see in the linked thread how a decimal and an octal number would lead to the same displayed number.
-In File Explorer it says track 8
-In Groove/New Media Player it says track 8
-In VLC it says track 10
-Opening the file in Notepad, at the top, after the title is track 10
"TPE1 ÿþV e n t u r e s TPE2 ÿþV a r i o u s TSSE ÿþL a v f 5 8 . 2 9 . 1 0 0 TIT2 # ÿþW a l k , D o n ' t R u n TRCK 010 TYER 1960 TXXX ' ÿþm a j o r _ b r a n d ÿþi s o m TXXX"
So both entries are there somewhere. The first line of the song data must have been placed by MP3Tag. I can't find the Windows data but it could be encrypted, hex, octal or something else.
File Explorer and Groove Music are both original Microsoft applications that use both the same faulty code base.
As the other programs interpret the track value correctly, you see the same as in MP3tag.
Most of the track numbers are correct. In this "album" I created there are 593 songs. The track numbers for WIN and MP3 both run to 593, but the WIN numbers have some duplicates
Yes - this is due to the leading zeros in 3-digit numbers.
If you remove the leading zeros in the field track, windows and the decent applications will show the same numbers.
Well that fixes my problem! Thank you very much 
The song I've been working with now shows the same number track that MP3Tag has shown all along.