Why does my batch program terminate saying ) is unexpected when there is seemingly no syntax error?

I have a batch program with below code segment inside it.

While executing, I can see the whole IF () statement [ending with line 20 with all 3 ')'s ] getting called first, as a single line.

It does execute the inner for loop also without issues. During the for loop iterations, I see the the block in line 3 after 'do' starting from '(' and ending with line 19 [ ending with two ')'s ] getting called.

But after this, it stops and issues an error ) was unexpected at this time.

I think after the for loop instead of resuming from line 21, it goes to line 20 and mistakes the ')' for an unmatched one.

Am I doing something wrong in this code? Is it the way the line breaks, or format/tabs causing the issues?

`

1 IF NOT "%2"=="/d" (
2   cmd1
3   for /F "tokens=1-2 delims=, " %%A  in (!Input_File!) do (
4       set objName=%%A
5       set objType=%%B
6       cmd2
7       REM comment1
8       if "!objType!"=="mapping" (
9           REM comment2
10          cmd3 arg1 arg2 arg3 arg4 arg 5 longarg6^
11              longarg7 longarg8 
12          cmd4
13      )
14      IF ERRORLEVEL 1 ( 
15          REM comment3
16          echo "FAILED: One or more steps returned >1 "
17          GOTO ENDOFBATCH
18      )
19   )
20 )

`