float() fail in some flow runs

[Wintermere]

Hi, I'm building a flow populates word file based on SharePoint item added. There are auto calculated fields that go as the input to "Format Number" and "GM Percent" respectively as below. My intention is to format these numbers to appear as 1,000,000 for "Format Number" and 23% for GM Percent.

Unfortunately some of the runs fail with below error while some of the run are successful. Can anyone point out where the problem is? 

Expression used for Format number is float(body('Get_item')?['Gross_x0020_Margin2']) 

and for GM Percent is float(body('Get_item')?['GM_x0025_'])

[annajhaveri]

@Wintermere  can you please provide what are the value for Gross_x0020_Margin2 and GM_x0025_ when the flow fails and when the flow succeeds?