In order for a list view to show up on Owler.com you may need to make one adjustment in Salesforce.com. 

Go into Salesforce and click on edit next to your list view name.  

This will open the List View Editor. 

Here you want to ensure that 'Filter by Owner' is set to either All Leads, All Accounts, or All Opportunities depending on the record type you are working with. 

Once this is selected you should be able to see your list view in Owler Pro!