Post Grid not sorting and not bringing all posts

Hi I have created a grid page for my post category "Intercultural Tools".And i had sorted it in descending order by date. But suddenly my post are not getting sorted properly and few post are not being displayed on the grid page.The posts on specific date that is from the year 2020 was not shown.When ever I am adding new posts the grid page is getting different and missing those posts..I am using Astra theme and beaver builder.
Kindly help me with this.