Deleting task from weekplan is still displaying on gcal.

Steps to reproduce-

1. Open the Link "https://app.weekplan.net/ "
2. Fill Login Details like Email Id and Password and click on Login

3. Work Space will be created with some User Name.

4. Click on the Work space settings at the start of the Page.

5. Create a new task with daily repetition of 6 days .

6. Delete task.

7. Check whether deleting task from week plan is still displaying on google cal or not.

Actual result - Deleting task from weekplan is still displaying on gcal.

Test Data : http://prntscr.com/af3jx4

: http://prntscr.com/af3k5u

OS and browser version - windows 7 and (Firefox 44.0.2)