Calder. he's using my editor.
It has a built in function that allows you to edit item stats.
As you pointed out move speed occurs at 2 different places, 23 and 52. Apparently he chose the 52 value in the item editor.
It actually loads the entire list from STR_ABILITY.STL and you can choose one from a drop down list. Wel technically it loads it from the "lookup" tab in the spreadsheet but that is a direct copy of the STL
It would appear that the 52 stat works fine in the client but doesn't work in the server. My guess is that the server only checks the 23 value since that one is used mostly.
Pretty much all the stats occur in two places on that list. The lower one seems to be used for items while the upper one is sometimes used for GM skills and stuff. I'm not entirely sure what the difference is but it's usually a good idea to use the lower one whenever possible.