Strange behavior regarding sorting

[MerleOne]

Hi,

I have a question regarding a strange behavior in a .urd database :
I have 2 folders, say A and B, in that database, that each contain several subfolders.

All A subfolders are very well alphabetically sorted, and whenever I add a new one, it gets sorted right away.

On the contrary, B subfolders are never sorted, each new B subfolder places itself at the bottom of the previous ones.

I see no difference in A and B folders properties.

Is there a parameter I should check ?

Thanks.