I always thought it was just a personal preference. I’ve seen Devorah spelled many ways (Devorah, Devora, Dvorah, Dvora). The same goes for Tzipporah and Tzippora, Rivka, Rivkah…For me, personally, the lack of the “h” in Devorah feels like something is missing.
Abe Cohen, usually that’s the case, but with the name Sara some people spell it as Sarah or Sara.