That is quite strange. After flashing the rom, did you flash a compatible gapps zip as well? If so, after the device booted, did you alter the build.prop at all?
Have you played around with the Hybrid Engine (specifically the modes such as Phone, Phablet and tablet) as I seem to recall this affecting some people. Check the properties of the Playstore in Hybrid engine as it could be that the Play Store thinks your phone is a tablet (why that would a 'universal' app like FB I have no idea though)
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