The specified browser was not found. [Current Browser]

I am getting failures for Navigating to an address based on the "Current Browser". These steps do not fail during a full test run, but if I start the test midway these will fail, not sure why they work in some instances but not others. I am iterating through a browser loop, so for these direct navigation steps I am using "Current Browser", if I am just using Chrome or just Edge and set these steps to those browsers there are no failures.

 

Example: 

Item: Navigate

Value: ProjectSuite.Variables.sitetorun

Operation: Current Browser

 

Failure: "The specified browser was not found. [Current Browser]"

 

TestComplete is able to run previous steps if started midway - it's not like it isn't seeing the browser. But the step of Navigating fails. Should I be doing something else other than "Current Browser" for these steps?