I am sorry to read about your issue @minaxi11
Can you please try using a browser in Incognito mode and advise if the problem persists?
If the sorting works when you are using the browser in Incognito mode it could be a browser extension that you are using that is clasing.
If the problem persists, please open the browser tools (how to open the browser tools) and try to sort the events. Do you get any errors in the Console tab? If you do, can you share them with us?
By the way, for future reference, when you have a support / technical problem open a support forum thread instead of posting a 1-star review. Then open a review based on the service, fix and functionality of the plugin.
Looking forward to hearing from you.