after few months it started not checking the task. I mean I check and few hours later it is unchecked. it should be cleared and the next date for the same task should be displayed, example: task 1 to date 01/jan/2019 and repeat task 1 to date 01/feb/2019. after checking the task for January the task for February should be displayed, but after some time the task for January is unchecked.