Yeah, it's hard to come up with a pattern.
I guess it depends on the perception of you each school had. If your reach school thinks they are among the highest-ranked programs that will make you an offer, then they are trying to "lure you in" with the funded offer. Conversely, if the safety school knows you'll get better offers, then they don't want to waste a funded place on you, but would probably fund you if you decide to go there.
Who knows. It could also be a matter of fit, or a thousand different factors.
It's weird, I have seen people with stellar credentials get rejected and people with ok credentials admitted at top departments.