Thanks for this Ben M.
Are you saying that I should delete the line
//# sourceMappingURL=bootstrap.js.map and /*# sourceMappingURL=bootstrap.css.map */
from the bootstrap4.0.0.CSS and the bootstrap-4.0.0.js files?
If I delete this will it affect the site in anyway?
If i wanted to ensure it is in the right location where should it be stored?
Thanks again.
Right now the way it's being included, it's looking for the bootstrap files at yourdomain.com/development/ and if they are not there it is generating the error. What's happening is it appears with the latest update that Dreamweaver is compiling the CSS to be included with your site, thus it generates a map. Having the link working or not should not affect your website. If you want the error to go away that sourcemap needs to point to an actual .map file on your site or that line should be removed.
However, I refreshed your page and it appears you have the pop-up back now and I see what you mean about the carousel. The bad news is, I don't see any javascript errors being reported in the console. I did look into a mailchimp account I have and I don't see any mention of having their code placed in the head of the document as you have it. Can you try placing their code at the end of your HTML document right before the closing </body> tag and see what happens?
I'm digging into this a lot more and as soon as I was looking up about placement, it appears there are a lot of issues with their pop-up code conflicting with existing JQuery elements for CMS platforms and web hosts alike. If this solution still doesn't work, based on what I am reading, I would open up a ticket with mailchimp to see what they say and consider using an embeded form in the meantime.