Data Type Changing When Report is Published (Text to DateTime)

Hello,

First time posting and newbie Power BI user here.

I have a Sharepoint Excel sheet from which I have created quite a basic report.

A number of the columns are set with a datatype of Text and all looks OK within Power BI desktop, exactly how I want it.  The problem happens when I publish the report - it is automatically converting these values to a DateTime format, which I don't want it to do. 

I have disabled the Auto datetime within the options but this has not helped..

This is how it is shown in Power BI desktop:

This is the result when published:

I do need to keep the columns as a text value for business reasons (users of the sharepoint doc will need to occasionally input text rather than a date) which is why I chose a text format.  I just need the report to publish "like for like".

I feel I must be missing the obvious.  Any ideas please?