Seems to be the EOT flags on the font that IE applies, when the other browser don't, as Jacek Glen said.
You should check for free equivalent to Trajan, like Cinzel :http://www.google.com/fonts/specimen/Cinzel
I'm not sure, but try that :
@font-face {
font-family: 'trajanpro';
src: url('trajanpro-regular.eot?#iefix') format('embedded-opentype'),
url('trajanpro-regular.woff') format('woff'),
url('trajanpro-regular.ttf') format('truetype'),
url('trajanpro-regular.svg#trajanpro_regular') format('svg');
font-weight: normal;
font-style: normal;
}
@font-face {
font-family: 'blackjackregular';
src: url('blackjar-webfont.eot?#iefix') format('embedded-opentype'),
url('blackjar-webfont.woff') format('woff'),
url('blackjar-webfont.ttf') format('truetype'),
url('blackjar-webfont.svg#blackjackregular') format('svg');
font-weight: normal;
font-style: normal;
}
I just removed the first "src" property, that shoudn't be specified twice. No idea why that would work for "My" and not for "west"...