Marriage status inconsistency

Hi!

I have a question that's haunting me a little. My great grandmother, Francisca Ríos, appears to be a widow at the moment of marrying my great grandfather: born in 1899, she marries Bartolomé Quezada in 1918, and the registry appears both in civil registration and church records, and it shows even in her baptism record.

However, in 1926 she marries José María Quezada, my great grandfather, saying that she's 22 years old. Her name, her parents' names and even her grandparents' names are exactly the same, but both the civil registry and the church records say she's "célibe", not a widow or anything of the sort. The church record doesn't mention any need for a dispensa, or acknlowledges in any way that previous marriage.

¿Does anyone have an idea of why this could happen? Two registries seem too much to be an honest mistake.