It’s a Symbol Font.
F020 is the Hexadecimal codepoint in the range used by symbol fonts.
To convert it to a standard font (Symbol fonts are legacy fonts), from the Tools menu, Convert, Convert to Unicode.
That will Change F020 to $20 which is the Hex code for a space character.
BTW: If you find it easier to think in Decimal, change the display from the View menu, Display format, Decimal (shortcut Ctrl J) and the codepoint for space will then be shown as 32.
The $F0FE and F0FF characters will be shown as $EE and $EF in Hex, or 238 and 239 in Decimal. That’s the î ï characters in most fonts.
The reason that these are displayed as .notdef glyphs is because you’re using an unregistered version of FontCreator. Please see the FAQ at the top of the support forum.