Same command, different results on 2 servers

[MK-2]

I have a little homebrew file to add new users. Currently we have years 7 and 11 on one server and 8/9/10 on another.
If I run the exe to add to the 8/9/10 server it gets to the point of using xcacls to do home area perms and works fine. On the other server it adds two of the three perms and leaves the user perms out.

Is there any logical reason why one server would accept three xcacls commands in a row and work and the other wouldn't accept one of the newly created user? It's driving me mad!!

[MK-2]

I forgot to add, if I manually type the line, it works fine, it only appears to be when run via the script. This was working before the six weeks hols yet isn't now.
I've also tried using xcacls.vbs but still the same