You appear to have a bug with the calendar sync feature. It processes appointments of >1 day incorrectly. eg: I have an appointment in my Google calendar from 11th at 12pm to 12th at 3.30pm. This is presented in WeekPlan as one task from 12pm-3.30pm on the 11th, with nothing on the 12th. Good app, by the way!
Customer support service by UserEcho