Basically, the player should be keeping track of what MAP level they are at. If they're using the 1, 2 and 3 hard coded weapon attack entries then they should ensure that the MA# buttons aren't set (click on the button if it is set to reset it). Similarly, if they're using the MA# buttons, then it's up to them to check that they are correct. As there are various feats/abilities that allow a PC to attack twice but only increase MAP once, or increase MAP after the two attacks, MAP is not automatically increased as it would mess up those abilities.
For this example, the player should have checked the MA# buttons and set MA#2 before using the trip activity.

