I Can't Reach the Inferno 1 Combat Rating Requirement

Take a look at this…

Obviously, as I can’t inspect your hero, I can’t see why you’re missing CR but the most common reasons are low set item ranks, low legendary gear ranks, low warband tableau level, low helliquary level, i.e. things that are not the base CR of the gear items you have equipped.

None of which is a bug though.