The dealer at Table 12 was just forced to give a bit of a remedial course to his players about what constitutes a raise or a call in terms of how the chips are placed into the pot. Some players were apparently not verbalizing their action by saying "raise" while tossing oversized chips into the pot and these actions, per the tournament rules, were ruled as calls and not raises, despite the players' intentions.
Remember, kids... when in doubt, if you want to raise, say "Raise!"