Forms creating new Columns from Mobile Response - Problem

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Hopefully someone can help me with an issue I have been experiencing. 

I have created a MS Form within MS Teams which is to be filled in daily from my staff via a weblink from mobile devices. So far this has been going very well, however today when I checked the responses via Excel, I had noticed that extra columns are being created in the Spreadsheet of responses. I have double checked the responses to make sure that there are no differences or extra answer added (it is locked down but just needed to check). Before it gets out of hand I am trying to find out how this has happened and how to stop it. 

Any ideas would be appreciated :)

Thanks