Open InDesign file order wises problem

HI,

I am using imac,OS: High Sierra, varsion 10.13.6, here i am open indesign file order wise its openning correctly,

but imac OS: Big Sur, version 11.3.1 here not opening correct order.

file naming:

01_FM_ind.indd.indd,

02_Intro.indd.indd,

03_A6451P_Chapter1_ind.indd,

04_A6451P_Chapter2_ind.indd,

05_A6451P_Chapter3_ind.indd,

06_A6451P_Chapter4_ind.indd,

07_A6451P_PartII_ind.indd,

08_A6451P_Chapter5_ind.indd,

09_A6451P_Chapter6_ind.indd,

10_A6451P_Chapter7_ind.indd,

11_A6451P_Chapter8_ind.indd

12_A6451P_PartIII_ind.indd,

13_A6451P_Chapter9_ind.indd,

14_A6451P_Chapter10_ind.indd,

15_A6451P_Chapter11_ind.indd,

16_A6451P_Chapter12_ind.indd,

17_BM_ind.indd

Kindly check and advise.

my code is:

myIndesignFiles = get_File(InputFolder,[],['.indd'],"FILE");

function get_File(dir,my_arr,extension_Arr,_File_Or_Folder){ //updated for copy file or folder
var f = Folder( dir ).getFiles();
for( var ifil = 0; ifil < f.length; ifil++){
var mystr=f[ifil]+"";
var aa=mystr.match(/\/[.].*/) //avoid hidden files and folders
var bb=mystr.match(/[_]VUC69~7/)
var cc=mystr.match(/DS[_]Store/)

if(f[ifil] instanceof Folder){
// no need go to sub folder

//~ if((aa==null) && (cc==null)){
//~ if(_File_Or_Folder == 'FOLDER'){
//~ my_arr.push(f[ifil]);
//~ }
//~
//~ get_File( f[ifil],my_arr,extension_Arr,_File_Or_Folder)
//~ }
}
else if(_File_Or_Folder == 'FILE'){
if(aa==null && bb==null && cc==null){
if(extension_Arr[0]=='.*'){
my_arr.push(f[ifil])
}
else{
for(var a=0;a<extension_Arr.length;a++){
if( f[ifil].name.substr( -extension_Arr[a].length ) == extension_Arr[a] ){
my_arr.push(f[ifil])
}
}
}
}
}
}//for

return my_arr; //my_arr - is file or folder
}

M Srikanth