I assume we are talking about a custom date field "deadline" created with Toolset Types plugin.
You can add a custom field filter into view block:
Select items with field:
deadline is a number greater than TODAY()
If you are using Blocks Editor, you can edit the page you mentioned above: hidden link
Find and select the view block, in the side bar, there is a section "Query Filter", add the filter as I mentioned above. See screenshot: query-filter.JPG
Luo is on vacation. This is Minesh here and I'll take care of this ticket. Hope this is OK.
Can you please send me temporary wp-admin access details so that I will be able to access the admin and check what is going wrong with your view filter.
*** Please make a FULL BACKUP of your database and website.***
I would also eventually need to request temporary access (WP-Admin and FTP) to your site. Preferably to a test site where the problem has been replicated if possible in order to be of better help and check if some configurations might need to be changed.
I have set the next reply to private which means only you and I have access to it.