First I tried to duplicate the 'Find Jobs' table. But again we faced the same problem - the source is getting defaulted.
So instead, I thought of taking another approach. Created a fresh 'Find Jobs' table sourcing the company table (containing 25k companies). In the preview, it showed some relevant jobs posted in the last 3 days. My idea was to just copy the template from the older table and somehow paste the table template in the new 'Find Jobs' table. But the moment I created this new table just to test this approach, the source again defaulted.