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Some apps although can be transferred to SD may not be compatible with running from an SD card and thus will be a blank icon or simply won't work or stop so I think in this situation that this is what you have encountered - To fix you could try transferring the apps back or you may just have to bite the bullet and do a factory reset saving what you need to 1st
This is a result of being able to move apps to SD. Please see this:
If you still see these apps under Settings -> Apps, try uninstalling them from there and see if that helps.
If you don't have them there, go to Settings -> Apps -> All -> Xperia Home -> Clear data -> OK and then restart the phone. But please note that this will reset your home screen to default settings.