Line numbers in source map incorrect

The line number sometimes are a bit off. I tried to get to the bottom of this and reduce as much styles as possible. See attached ZIP. I'm using the NodeJS API and basically this code (excerpt):

let { code, map } = transform({
  filename: 'style.css',
  code: Buffer.from(codeBuffer),
  inputSourceMap: Buffer.from(mapBuffer),
  minify: true,
  sourceMap: true
});

code+="\n\/\*# sourceMappingURL="+path.basename(outfile)+".map */\n";

If included the input code (index_unminified.css) and input source map (index_unminified.css.map) in the ZIP. Now for this selector: ".paragraph-stage .body .field-body h1.text-align-center strong" the line number shown in the browser's developer console is 63. Correct would be 76. If I remove anyform_errors.scss, it works. So the problem must be caused by the styles in this file. I couldn't narrow it down further unfortunately. Hope it helps.

sass.zip