Options in drop down box revert to small font

Hi, I'm using a work spreadsheet, I didn't do the spreadsheet myself but coming up with ways to improve it. There is a small inconvenience where, information is selected from a drop down box created, however all the options in the drop down box when opened are showing as a really small font and hard to read. I suggested the information it is pulling it from be in a higher font but was explained this has allready been tried and is unsure why its still showing small font in the drop down box when selected. Wondering if there are any known causes for this and how to fix if possible, I might request checking the spreadsheet myself but its locked so cannot see the formatting size where the info is getting pulled from. I figured it would be the font size of the data but if this has been tried, i'm at a loss. Thanks heaps if can help :)

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