Thread: C++ list Strange Behavior

I m using list in my window mobile app but experienced strange behavior.
For example,

Code:

for(int k=0; k<50; k++)
	list1.push_back(100);

The list1 only contains the first 31 entries of 100, the remaining 19 entries are fill with '?'
One of the possible reason maybe due to insufficient memory, however, when i test with

Code:

for(int k=0; k<200; k++)
	list1.push_back(100);

The list1 contains the first 127 entries of 100 and the rest are fill with '?'

What could be the possible reasons? thanks.