GREP find results change sort order

As a test, I’m running a very basic Applescript to iterate through consecutive song numbers in a document. The song numbers are all in order in the document, but the GREP results are not in order. i.e. the numbers returned are 5,6,22,24,3,1,12,etc. instead of 1,2,3,4,5,etc. This is not a flowing document, so I presume it may be based on the order the text frames were created? I can sort the array(s) after the fact, but this seems like there’s a grep preference that I’m unaware of, or something? Any insights?