problems displaying fonts onscreen

I use Font Creator 7.5 professional edition to make symbol fonts. The fonts print out OK but when we use them with an onscreen viewing software the top and the bottom of the characters is often cut off.
Font in Word.jpg
I have tried re-sizing the Joker Character but it still appears wrong at some on screen font sizes

Any ideas on how to fix this problem we have been using font creator for several years and have only recently had this problem

It could be an issue with hinting, or some glyphs are exceeding the WinAscent/WinDescent.

Run Calculate on the Font, Properties, metrics dialogue using the Maximum setting.

Check that Autohinting is enabled in Export Settings.

Attach your project file *.fcp if you’re still having issues.