Weird behavior of my GSM Modem or Problem with my Code?

I collect the received SMS using this string :

Code:

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DEBUGIN 5000,main2,[WAIT("UNREAD"), SKIP 3,STR num\13, SKIP 27,STR sms\25\13]

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The problem is that when I display the received sms string using the following:

Code:

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DEBUG "Num=",STR Num\13,"  SMS=",STR SMS,13,10

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I get a very strange problem, which is that a SPACE comes before the sms string for some reason. However, when I do the same with another incoming SMS, the sms string stores it fine.

What is mean is this: (When the Debug command is executed)

Code:

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Num=1111111111111  SMS=admin
Num=1111111111111  SMS= admin ' Notice the space before admin

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I am scratching my head to find out why this is happening. If I change the SKIP 27 to 28 then I loose my first alphabet in some cases.

I also tried the following:

Code:

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If (SMS[0]=26) OR (SMS[0]=13) OR (sms[0]=10) then
                    for a= 0 to 23
                        SMS[a]=SMS[A+1]
                    next a
Endif

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But the code never enters this loop to correct this error for some reason. Any ideas???