This might help you to find your solution.
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print the result of get_terms without arguments
$chaptertitles=get_terms( 'chapters'); print_r($chaptertitles);
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Check in above result can you get the item id 74 & 76.
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I think you might not get the the item id 74 & 76 that’s why you get the zero for $count1.
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Include the item which you may get in
$chaptertitles
.