Why does CSV include   after being imported into Excel?

Question

The line in question looks like this:

LongWord (Word Word 7) - Word - +55555555

And when it's imported it looks like this:

LongWord (Word Word 7) - Word - +55555555

The .csv file is generated in the browser using .js:

    /**
     * Generate CSV file in browser and download
     */
    function download(csv) {
        // CSV File
        var csvFile = new Blob([csv], { type: 'text/csv' })

        // Download link
        var downloadLink = document.createElement('a')

        // File name
        downloadLink.download = self.filename

        // We have to create a link to the file
        downloadLink.href = window.URL.createObjectURL(csvFile)

        // Make sure that the link is not displayed
        downloadLink.style.display = 'none'

        // Add the link to your DOM and click
        document.body.appendChild(downloadLink)
        downloadLink.click()
    }

I can't find other examples online of this happening nor can I debug it.