FAT/Carbs inverted value

Hi everyone.
Why in the summary XERT ride, (in the XOL / activity web page), the Fat / Carbs. value is inverted ?
ie: today, on my Garmin Edge 1040 (but same problem w/ 1030) using a datafield w/ XERT value, i have burned Fat: 133 gr. and carbs: 85 gr.
But, in the summary in XOL activity, this value is inverted. I have ride only in z1/z2 zone and w/ a low/moderate effort, and ending the ride, i have again see the value.
Thanks in advanced for the support.
Corrado S.