Multipart entity not working properly

[TheCursedModder]

Hello I've been having some issues with Multipart entities and that it is constantly taking damage.
The video below shows the issues.

Also the hit boxes that are moving constantly seem to be still, because you can still be seated on the hit box where it is suppose to be. 
Here is some modified code taken from EnderDragonPart.

public class TheHeartPart extends PartEntity<TheHeart> {
    public final TheHeart parentMob;
    public final String name;
    private final EntityDimensions size;

    public TheHeartPart(TheHeart pParentMob, String pName, float pWidth, float pHeight) {
        super(pParentMob);
        this.size = EntityDimensions.scalable(pWidth, pHeight);
        this.refreshDimensions();
        this.parentMob = pParentMob;
        this.name = pName;
    }
    @Override
    protected void defineSynchedData() {
    }
    @Override
    protected void readAdditionalSaveData(CompoundTag pCompound) {
    }
    @Override
    protected void addAdditionalSaveData(CompoundTag pCompound) {
    }
    @Override
    public boolean isPickable() {
        return true;
    }

    @Nullable
    public ItemStack getPickResult() {
        return this.parentMob.getPickResult();
    }
@Override
    public boolean hurt(DamageSource pSource, float pAmount) {
return false;
        //return this.isInvulnerableTo(pSource) ? false : this.parentMob.hurt(pSource, pAmount);
    }
    @Override
    public boolean is(Entity pEntity) {
        return this == pEntity || this.parentMob == pEntity;
    }
    @Override
    public Packet<ClientGamePacketListener> getAddEntityPacket() {
        throw new UnsupportedOperationException();
    }
    @Override
    public EntityDimensions getDimensions(Pose pPose) {
        return this.size;
    }
    @Override
    public boolean shouldBeSaved()
        {return false;}
    }

Any help is greatly appreciated!