Plugin forgets entered search term

Hello,
We are currently experiencing an issue with our Resource Library page of our website.
URL to the page:https://www.familyjusticecenter.org/resources/

The issue is described below-
When search terms are entered, and users click between pages of results, the plugin ‘forgets’ the entered search terms.
Please find the Images below-
1. The terms are entered in the search section to look for a resource.
ScreenShot: http://www.familyjusticecenter.org/wp-content/uploads/2021/03/screenshot-issue1.png

2. The result page is visible with specific pages as requested in the search bar –
ScreenShot: http://www.familyjusticecenter.org/wp-content/uploads/2021/03/screenshot-issue2.png

3. The Error is here; When the users click between pages of results, the plugin ‘forgets’ the entered search term and displays all the pages instead of 2 pages displayed before because the search terms are now all available terms.
ScreenShot: http://www.familyjusticecenter.org/wp-content/uploads/2021/03/screenshot-issue-3.png

4. The other error type is that it displays no results, even though it was displaying 2 pages of results previously.
ScreenShot: http://www.familyjusticecenter.org/wp-content/uploads/2021/03/ScreenShot-issue-4.png

Looking forward to resolved this issue soon. Please let me know if you have any questions.

Thank you!