Why the num of predictions always one less than my config?

Hi everyone, I’m a novice in data competition. I just met a problem that the num of predictions in pred.csv which is generated by function >>match_and_make_prediction<< is always one less than my config. E.g. it generates 99999 when I set max_results 100000 and 499999 for 500000.
Looking forward for any response.