Front outdoor landing/entry decking is separting. How do I fix this?

The decking I have over my 53 year old poured concrete steps has an opening that has expanded from 1/4" to almost two inches over the last five years. I am uncertain as to what to do to repair this. Do I unscrew the decking and replace the support beam underneath or reset the decking an add a piece ? It is faced and is the top of two steps. I have tried to find a solution and haven't had acceptable advice from anyone at this point. What is the best thing to do? I'm sorry that I have no picture to post. Help!

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