Behavior I don't understand with variable

I have an error in my logs - it comes from RL. I reported it and was told it was the driver. I reported to the driver forum and was told it was RL... shrugs

I took it upon myself to determine the failure - regardless how I got here, I was attempted to stuff a device attribute into a variable and set up a rudimentary logging so I can debug.

When setting the rule to store the variable I see a second set of paranthesis. In the screen cap below, the 3rd line down I set a number variable to a numeric attribute from a driver and pick up a wrapping of paren's - it's not in the device attribute page. Is this some trick to flag a variable is a number or something?

This seems like a relevant distinction to be made in order to troubleshoot effectively.

Is it a community developed driver?