We think this is an apples to apples comparison. I've attached the workflow log from both local and Firecloud execution, as well as the WDL (which has 4 tasks).
The firecloud workflow execution ID was 2f2d0fd6-4935-4bb3-bfe0-eb0f19774920, invoked from the broad-firecloud-gdac/dev workspace (via the monitor URI https://portal.firecloud.org/#workspaces/broad-firecloud-gdac:dev/Monitor/f8022611-fd8f-4b79-a4df-23fed28ad363)
Thanks,
Mike