Does Credit Score Decrease After First Time its Generated?

I have no Cibil Score till July as I haven't taken any loan in last. But due to this my credit card application was not accepted by any bank so I applied for a secured credit card so that my credit score is generated. Initially it gets generated to 745 by now its dropped to 723 even i had paid my bills on time. Does it happen will all the people whose credit score is generated for first time ?
 
Top