My keyboard does not allow me to input them all but I have found four (similar) ways in total of writing the Chinese character for yellow (黄). Why is this and how have these four forms come to differ?
Simplifed variant (Unicode point U+9ec4)
Traditional variant (Unicode point U+9ec3)
Kangxi radical 201 (Unicode point U+2fc8)
Variant character (Unicode point U+2155b)
Variant character (Unicode point U+28774)
The display font maybe doesn't have these variant characters. Try using a different font