Data (booleans) in report changes after auto refresh

Hi, 

I have a dashboard with a simple table, one of the columns contains a boolean and thus a true/false value. This value is shown by means of an icon. 

When I view my dashboard in PBI Desktop all the data is completely correct, also when I publish this to PBI Service everything is still fine. But from the moment the data is reloaded by the automatic refresh, some icons in this column change, more specifically: all FALSE values change to TRUE values. 

Does anyone have any idea how this is possible or what I might be doing wrong? 

Thanks for the help!