Pie Chart will not display appropriate data from calculated field

[Daniel Drysdale _UK_]

Hi all thanks very much for your help. 

I am trying to add a pie chart to a dashboard which will show when a request is due renewal. I use a calculated number field to work out the how many days until renewal are required here :

I then use this field to group into less than 60, between 60 - 90 etc and store it in a calculated select list. 

which does group them correctly and the correct information shows on the issue page, however when I add to a pie chart these categories do not show correctly.

I have no issues with the value none and far more than only 1 with less than 60. 

Any guidance would be much appreciated. I tried to use a calculated text field instead of calculated select however it returns the same charts. 

Thank you