XLS to PDF needs to zoom to 800% for proper displaying

We receive excel xls files from our partners and clients that contain many columns and some may be merged. When converting these xls file to pdf the image is incredibly small and we must zoom to 800% to see the pdf in normal size.

Is this a convert setting that we should be using to get this to convert properly?

I can not share the XLS file since it contains confidential information.

thanks,

Sal