Snopes "debunked" the cross picture and called it "Mostly False"
Their hilarious excuse is:
"Due to the low resolution of the video footage and lack of explanation from Gates herself, it cannot be proved whether the cross had four equal arms or one longer arm. Even if the latter were true, whether the cross was intentionally (or unintentionally) flipped upside down is unknown"
https://www.snopes.com/fact-check/melinda-gates-upside-down-cross/