I am doing some tests of heap use in many devices from different manufacturers. In the test of image heap use, some Motorolas devices give me a negative value when a calculate the total of memory used. But the weirdest thing is that situation sometimes happens and sometimes doesn`t. In any different manufacturers devices I did not got any negative result like that.
I have tested in Motorola V3, U6, and a Palm Tungsten C (which has a motorola processor).