App updates disappear from Play Store after changing DPI?

I changed the DPI on my 610 and at the time I had like 6 app updates available including facebook, Twitter, maps, gallery, etc. Once I rebooted with the new dpi, the app updates were gone. When I went back to the original dpi and rebooted the app updates were available again. Any ideas as to why? I'd like to keep my changed dpi because I think the original dpi (240) makes things way too big in that small screen.

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