CORS request blocked in Lightbox

Hello!

I’ve been enjoying using your Photo Gallery, but have run into an issue I don’t know how to fix, not being a developer.

In some galleries (all of those under ‘Artwork’ on my website, but not in ‘Musicians’), when the Lightbox opens, the navigation arrows and the X don’t show (instead there are squares).

Inspect of the pages says the following:

“A cross-origin resource sharing (CORS) request was blocked because of invalid or missing response headers of the request or the associated preflight request .
To fix this issue, ensure the response to the CORS request and/or the associated preflight request are not missing headers and use valid header values.
Note that if an opaque response is sufficient, the request’s mode can be set to no-cors to fetch the resource with CORS disabled; that way CORS headers are not required but the response content is inaccessible (opaque).”

Affected resources noted:
bwg.ttf?qy18kk
bwg.woff?qy18kk

Can you please help me fix this?

Thanks a lot, I appreciate any help!

p.s. I am aware that I am using a theme that is no longer being updated and would like to keep it for the time being.

The page I need help with: [log in to see the link]