line chart "send values to excel " problem

[anat]

Team,

implemented line chart with 2 expressions,when i click on "send values to excel" option or "send to excel" ,data exported into Excel but first expression header is missing.this problem only with line chart,if i use bar chart then everything is OK.

below are the screens

line chart:

after click on "send to excel"

[avinashelite]

Strange , I have never faced this issue , could you share the app ?