How to make red distinguishable from grey in Terminal profile "Pro"
The problem is likely due to your vim settings rather than your terminal settings.

The color you mentioned is pretty close to color 224 (of 256 colors), so you might try looking in your vim colorscheme to see if that color is used in a ctermfg= declaration.

To test and see if I'm right you could try

:syn match Foo /foo/
:hi Foo ctermfg=red


If that turns the word foo red then you know your terminal's red is working properly and it will be an issue with your vim settings.