Gregorio Sandoval Legaspi's wife

Hey everybody!! I have a question about Gregorio Sandoval Legaspi and his wife.

I descend from his son Nicanor Sandoval, who married Sotera Rodríguez in 1878 and then Ramona Pulido in 1906. In the marriage with Ramona Pulido it states that he is a widow and mentions Sotera Rodríguez, and his parents are Gregorio Sandoval Legaspi and Dolores Pulido. This also matches their grandson, Maximiano Sandoval - my great grandfather.

However, in the marriage registry of Nicanor Sandoval and Sotera Rodríguez (his first wife), Nicanor appears as son of Gregorio Sandoval and Teresa Espinoza, and I don't understand this at all. All the other names match, the dates match, and "Teresa" doesn't sound like "Dolores" at all. It's also not a full name; she is "María Dolores Pulido de los Ríos", so nothing close to "Espinoza". Also, I searched for a registry for Gregorio Sandoval and Teresa Espinoza, and didn't find anything at all.

Do you think it was just a weird registry mistake?