When you create worksheets that will be used by others, it’s important to make sure they can only enter valid data. Use Excel’s data validation features to make rules to restrict the type of data or values that others can enter into a cell. 

For more tips like this, check out the working remotely playlist at www.youtube.com/FoetronAcademy . Also, if you need any further assistance then you can raise a support ticket and get it addressed.