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How big is your part?
This can also be a tolerance problem.
Check you tolerance of the through curves feature.
Maybe try to set this lower.
Other its also if you you use cross curves to use the "through curve mesh" commnand.
This command is all most the same as through curve but you can set now also the cross curves to get a good closed surface.
Just a quick note regarding "align facets along edges", per the documentation: "When the Align Facets along Edges check box is selected, the rendering time required to generate the facet edges may increase".
This is noticeable in larger, complicated parts.