Arrows allow you link icons together and track traffic flows (as long as you have Funnelytics PRO). The dark line with an arrow represents "Direct Traffic".
The ghost line simply is there to represent relation or "Indirect Traffic".
Why Can't I Connect My Pages to Sources Using a Direct Line?
When you're creating a sales or marketing funnel, it’s impossible to track direct traffic from a page to an email or another offline source icon. There's no way to send a user to an ad or an email from one of your landing pages! To show that a user receives an email or goes to an offline source, you need to use a ghost line.
If you use the direct line to connect to a source, it will automatically change it to a ghost line!
If you have any questions or need further clarification, remember to reach out to our support team anytime by clicking the support icon in the bottom-right corner of your dashboard, we are always ready to assist you!