Portfolio Alignment Issues

Hi

I am using the portfolio option to display team members on an about page as per this link – https://www.grosvenorconsultancy.co.uk/about-us/

The team members display based on the date they were created but some are displaying in a different order and at the bottom there is 1 on the left hand side and 1 on the right hand side with a big gap in the middle. This happened when I removed a team member so I have updated theme, plugins and wordpress to latest version but still the same issue. Any advice on how to fix?

Thanks