
According to my test in Excel 2016 and Excel 2010, emoji(crayon) displays correctly in Excel 2016.
I could reproduce your issue in Excel 2010.
This may be by design.
It is recommended to change the emoji(crayon) to a symbol that could display correctly.
For reference, you could insert symbols in Insert>Symbols>Symbol, select the font Tahoma, and choose the symbol you would like to use.
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