Adding new directories instead of changing files in subfolders when pushing to FTP

[FrederikStenberg]

I'm trying to push my files to my FTP using ftpush, but instead of updating files in subdirectories, its creating new folders with complete paths:

I'm running my environment on Windows, while my co-developer running on MacOS (using the same gruntfile and json files, doesn't seem to run into this issue.

Here's my config:

'sftp-deploy': {
			buildsftp: {
				auth: {
					host: login.live.host,
					port: 22,
					authKey: 'live'
				},
				cache: '<%= path.devAssets %>/dev/grunt/ftpush/live.json',
				src: '<%= path.root %>',
				dest: '/var/www/html/wp-content/themes/cvhelpr/',
				exclusions: [
					'_production',
					'.gitignore',
					'.git',
					'**/.DS_Store'
				],
				progress: true,
				simple: true
			}
		},

I'm not receiving errors when pushing to FTP, so I have no idea how to approach this issue.

I've tried both using simple: false and simple:true, but it's the same result.

Could this be related to node/npm or ftpush version?