The padlock is used in ''Get Latest Revision' feature. here is the behavior:
if the padlock is unlocked of an input in formulation spec, the system will always auto-update the input to the latest version with the 'Approved' tag in its WFA status. for example, you unlock the padlock of input A-001 in formulation A, then you Issue the input A-001 to input A-002, meanwhile, you workflow A-002 to a status which has assigned to 'Approved' tag, then the input in formulation A will automatically update to input A-002.
In your example, I am not sure what update of the material did you make? the system will not automatically update any basis information of the input until you click 'Refresh' from tools.