Apps do not exist on moving them to SD card on Tab-1030 I have a Tab-1030 Android tablet (Tab-1030) with Android 4.0.4

Whatever apps I move into the SD Card get deleted. The first occurrence happened when for some reason my tablet couldn't connect to the wi-fi and I couldn't access Google Play.

After that I restarted my tablet (it also took longer than usual to start up again) and when I tapped on one of my games, it announced that the app didn't exist. Looking deeper into it, all the apps (5 of them) that I moved into the SD card had no data. They were deleted!

The blank apps showed that they had cached data which was a lifesaver because after I re-downloaded the apps some memory of what I had done was saved. 

From there I tried to not move any important apps to the SD card, but a few months later the same thing happened. This time it was because I mounted my phone's microSD card (16 GB). After I unmounted the microSD card, the few apps that I moved to the SD card had again been deleted. 

Can someone, anyone help me out and explain to me why this happens?
You pretty much answered yourself: you move your apps to your SD card, then you unmount your SD card.

No SD card -> the apps in it are not there anymore -> Android considers they have been deleted.