I'd say let them wonder. :) Joking aside, the fact that they wondered if it's something different does not quite equate to being confused by it. It's not that it suggests anything in particular that is wrong, but that it's a detail which may or may not be significant (and happens to not be so in this case). They could wonder about whether the differently colored floors hold meaning, or wall decorations and colors, or the plant graphics on grass tiles, but some seemingly unimportant details turn out to be just that. The effects are clearly written on the talent selection screen, and if my guess is right, they did end up choosing based on that anyway.