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It is difficult to determine the exact reason without looking at the code. However, some possible reasons could be:

1. The method is not being called inside the loop: Make sure that the method is being called inside the loop and not outside it. If it is outside the loop, it will execute only once.

2. The loop runs only once: There may be a condition that terminates the loop after one iteration. Check the loop condition and ensure that it allows the loop to run multiple times.

3. The method modifies loop variables: The method you are calling inside the loop modifies the loop variables in a way that the loop condition is not met for subsequent iterations. Check if the method modifies any of the loop variables and if it does, make sure that it updates them in a way that allows the loop to run multiple times.

4. There is an error in the code: There may be an error in the code that prevents the loop from running multiple times. Check for any syntax errors, logical errors or runtime errors that may cause the loop to terminate prematurely.