Why did making change to Login Script prompt WIndows First Time Login Message????

I added an echo line to the beginning of my login script and a sleep line at the end. Doing so, had all users receiving the Windows message that you see when you open Windows for the first time. I removed the echo line and this seemed to eliminate the issue, but I do not understand why it happened. Here was the script;

echo Welcome to Dan's Compeition. Authorized Users Only
\\DANS6\ANTI-VIRUS\PCCSRV\AUTOPCC
net use O: \\servername\apps /yes
net use \\eic\ipc$
\\servername\netlogon\sleep 5

Thanks for any input you might have.