TS1702 why can't i update the app more than 50mb from itune but can throught wifi?

I tried to update Apps more than 50mb through itune, but found the Apps which are needed to be update are mark "Downloaded" in iTune store.  Of course if the Apps mark "Downloaded" are not able to do anything with it.  On the other hand, I can simply use wifi to update the Apps, more than 50mb, throught my iphone instead of iTune.  Is there any problem with iTune or something wrong with my phone?

In the App section of your itunes library ( NOT the sync pages) there is a button at the bottom which says Check for updates

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