win32汇编invoke伪指令的问题，究竟是不是编译器的bug？

.386
.Model Flat, StdCall
Option Casemap :None
Include        windows.inc
Include        kernel32.inc
IncludeLib    kernel32.lib
Include        user32.inc
IncludeLib    user32.lib
.DATA
    lpFomat    db "%lu",0
.DATA?
    hInstance        dd ?
    AA    byte 16 dup (?)
    BB    byte 16 dup (?)
.CODE
L1:
call L2    ;向后面标号CALL时L2-L1=10,向前面标号CALL时L2-L1=5,为什么,怎么解决?
L2:
pop eax
ret

START:
;原始写法----------------------------------------------------
    push L2-L1                                ;这里L2-L1算出的是 5
    push offset lpFomat
    push offset AA
    call wsprintf
    add esp,0Ch
;伪指令invoke写法--------------------------------------------
    invoke wsprintf,offset BB,offset lpFomat,L2-L1    ;这里L2-L1算出的是 10
   
    invoke MessageBox,0,offset AA,offset BB,0        ;为了直观用信息框显示
    invoke ExitProcess,0
END START

00401000   .  E8 00000000   call    00401005
00401005  /$  58            pop     eax
00401006  \.  C3            retn
00401007 >/$  68 05000000   push    5                      ; /<%lu> = 5               直接L2-L1，结果是5
0040100C  |.  68 00304000   push    00403000                         ; |Format = "%lu"
00401011  |.  68 08304000   push    00403008                         ; |s = test1.00403008
00401016  |.  E8 3B000000   call    <jmp.&USER32.wsprintfA>          ; \wsprintfA
0040101B  |.  83C4 0C       add     esp, 0C
0040101E  |.  68 0A000000   push    0A                               ; /<%lu> = A (10.)
00401023  |.  68 00304000   push    00403000                         ; |Format = "%lu"
00401028  |.  68 18304000   push    00403018                         ; |s = test1.00403018
0040102D  |.  E8 24000000   call    <jmp.&USER32.wsprintfA>          ; \wsprintfA
00401032  |.  83C4 0C       add     esp, 0C                                        ; invoke这里计算的是10
00401035  |.  6A 00         push    0                                ; /Style = MB_OK|MB_APPLMODAL
00401037  |.  68 18304000   push    00403018                         ; |Title = ""
0040103C  |.  68 08304000   push    00403008                         ; |Text = ""
00401041  |.  6A 00         push    0                                ; |hOwner = NULL
00401043  |.  E8 14000000   call    <jmp.&USER32.MessageBoxA>        ; \MessageBoxA
00401048  |.  6A 00         push    0                                ; /ExitCode = 0
0040104A  \.  E8 01000000   call    <jmp.&KERNEL32.ExitProcess>      ; \ExitProcess