when does python logic breaks?

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Note: this may be a duplicate question. I am trying process a very large set of data with a python list. The list contains tuples of 3 items. At some point my code is acting very strangely. Not sure if the quantity of data processed has affected it or not.

for ...........:
    if int1 - int2 >= int3: 
        break 
    print int1, " ", int2, " ", int3

It is printing 2220000, 180000000 and 256 at some point during the loop. I also have other dictionaries that contain large number of data. What exactly is happening here?

when does python logic breaks?