Raymond please have a look on it.
This entry 
CGI INC  GIB.A 4/16/2018 $66.92 1/3/2019 $80.52 10.40% should be 20.3%
10.40% was correct however entry price shown was wrong.
Its showing correctly now.
One thing please keep in mind you have to add the buy call first which you need to engage to sell call on same dates.