Weird behaviour on else branch coverage

[gpincheiraa]

I having a weird behaviour when the reporter shows me the branch coverage else-statement even if this code is under cover by my tests. The problem it's that always shows a else branch coverage in the same line ... even if i swap the lines!!

My config is the following:

karma.conf.js

var webpack = require('webpack');

module.exports = function(config) {
    var wsPort = process.env.wsPort || 8000;
    var webpackConfig = Object.assign({}, config.webpack, {
        plugins: config.webpack.plugins.concat([
            new webpack.SourceMapDevToolPlugin({
                filename: null,
                test: /\.js/i
            })
        ]),
        module: Object.assign({}, config.webpack.module, {
            postLoaders: (config.webpack.module.postLoaders || []).concat([{
                test: /\.js$/,
                exclude: /(test|node_modules|bower_components)\//,
                loader: 'istanbul-instrumenter',
                options: {
                    compact: false
                }
            }])
        }),
        // Esto es necesario porque karma-webpack muta el output, causando un error al correr junto con start-main-server
        output: Object.assign({}, config.webpack.output),
        entry: undefined
    });
    return {
        files: [
            { pattern: 'test/unit/test-main.js', watched: false }
        ],
        preprocessors: {
            'test/unit/test-main.js': ['webpack', 'sourcemap']
        },
        webpack: webpackConfig,
        webpackMiddleware: {
            stats: 'errors-only'
        },
        frameworks: ['mocha', 'chai', 'chai-as-promised', 'sinon', 'sinon-chai'],
        browsers: [],
        proxies: {
            '/ws/': 'http://localhost:' + wsPort + '/ws/',
        },
        client: {
            mocha: {
                reporter: 'html' // change Karma's debug.html to the mocha web reporter
            }
        },
        singleRun: false,
        plugins: [
            'karma-webpack',
            'karma-mocha',
            'karma-mocha-reporter',
            'karma-chai-plugins',
            'karma-sinon',
            'karma-phantomjs-launcher',
            'karma-sourcemap-loader',
            'karma-coverage-istanbul-reporter',
            'karma-junit-reporter'
        ]
    };
};

karma.coverage.js (I load this configuration in a separated file using gulp)

module.exports = {
    preprocessors: {
        'test/unit/test-main.js': ['webpack', 'sourcemap'],
    },
    browsers: ['PhantomJS'],
    reporters: ['coverage-istanbul', 'mocha', 'junit'],
    coverageIstanbulReporter: {
        reports: [ 'text-summary', 'html', 'cobertura', 'lcovonly' ],
        dir: '_build',
        'report-config': {
            html: {
                subdir: 'lcov-report'
            },
            cobertura: {
                file: 'cobertura-coverage.xml'
            },
            lcovonly: {
                file: 'lcov.info'
            }
        },
        fixWebpackSourcePaths: true
    },
    junitReporter: {
        outputFile: '_build/test-reports/TEST-index.xml',
        suite: 'Unit Tests',
        useBrowserName: false
    },
    mochaReporter: {
        output: 'autowatch'
    }
};

I attached multiple screenshoots showing this.

Check this out images that show that if i swap the lines, the else branch it is showed always on the same line