In your case it looks like "MIDDLE RIGHT" justify was how the block was originally set up. Someone then changed the justification to "MIDDLE CENTER" - throwing off all the text placement.
If you want to fix it all at once, just select all the text in the block, go into the properties window and change the justification back to "MIDDLE RIGHT" and it will recenter all at one time.
If you want to keep the justification "MIDDLE CENTER", like you have it in the drawing, you would just need to use a move command and move all of the MTEXT's over to the left slightly.
-ChriS