Dear, I check again, i see problem on your site.
1. I see your site use company filter with custom but you not add 'Custom Letters' . Please go to admin menu 'Jobmonster -> Settings -> Company' and change setting 'Company Alphabet' to Default
2. Deafult Jobmonster use Masonry style and it will load all company on one page but your site have many Companies, it will cause site slow to load. To fix your problem, please go to Customizer -> Job -> Company Companies List' and change settings 'Companies Style' to 'Grid' to load companies with pagination.
Best regards,