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Because that heat is being used to break the intermolecular bonds which then causes the phase changes (for example: with water, from solid to liquid, the heat is breaking up the bonds between the H20 molecules that were compacted, making the molecules shift around more, which causes the eventual change to liquid)
Changing the amount of heat energy usually causes a temperature change. However, during the phase change, the temperature stays the same even though the heat energy changes. This energy is going into changing the phase and not into raising the temperature. This means that there is a constant temperature as the phase change takes place.
Temperature is the average kinetic energy of particles and indicates the random motion of particles. Heat is a form of energy that transfers between two substances due to a temperature difference. During a phase change heat is used to break the bonds between molecules to change the state of the substance. An example is when heat is used to break the bonds between ice molecules during a phase change into water (melting). The average kinetic energy does not change at the instance of melting. Therefore the temperature of the molecules does not change, but rather the bond energy changes between molecules.
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