The BOINC SGS project is configured to send out "twin" WUs, which causes LLR to automatically do the -1 form first, then, if -1 is prime, also check the +1 form. (It's possible other twin forms are also sent out as WUs.)
So if a prime is found, two tests are done.
Please do not PM me with support questions. Ask on the forums instead. Thank you!
My lucky number is 75898524288+1