Alphabetical grouping in contact list does not completely work

[micser]

There is something weird in alphabetical grouping of contacts in the contact list.
My list of contacts is grouped alphabetically for contacts from A to S, but then I have all the rest of my contacts in the S group.
That S group includes several contacts beginning with S, several T, several V and do on.

Not sure if that's clear enough or if you need a screenshot to understand it.

I'm using wazapp 0.9.22 on a Nokia N9, let me know if I can provide more information about this to help you understand it.