Hi Dale
Thank you for the additional CSS, can you confirm this is what you see (with different images)?
If not, that would indicate we do not have all the necessary CSS/HTML. If so, could you please upload all relevant HTML/CSS to codepen/JSFiddle/GitHub/GitLab (whichever you prefer) and share it with us? You can anonymize the data if you like and/or strip everything until there is nothing left except for the issue. Sending an attachment by email is not something I like due to privacy/security and it would not be possible for others to see the original issue.
If it is what you see, can you explain the issue again please?
I do not work for Twitter/Bootstrap or FCC. I try to give back to the Web community by answering questions during my free time.
Cheers
Tom