Hello,
I am sorry you are experiencing this. You might have forgotten to plug in something, or the digitizer you have installed might be faulty. Try opening your tablet up and check your connections. Be sure to unplug the battery before you do anything, as it could fry or damage components on the mother board. After unplugging the battery, try reseating the touch cable. If all of those fail, you might need to get a new digitizer. I hope this helps!