I placed the font files (extracted from the jbcore folder) to the following, which was recommended by Drupal community -
\sites\all\libraries\juicebox\classic\fonts -
That sounds correct. The module's documentation (Step #3 on this web page) states that you should copy the entire contents of the 'jbcore' folder to your /sites/all/libraries/juicebox/ directory. You should not need to find the font files specifically, though: just upload the entire contents of the 'jbcore' folder to your /sites/all/libraries/juicebox/ directory, keeping the 'jbcore' folder structure intact, and the font files should be uploaded (along with all the other resource files that Juicebox needs) to the correct location on your web server.
The problem is likely to be caused by one of the following:
(1) Please double-check that the font files are present in the correct location on your web server. Even if you find that they are where they should be, try re-uploading them in case something happened during the initial upload which has somehow resulted in corrupt files.
(2) A browser setting or extension might be causing the problem. Try viewing your gallery in a different browser (Edge, Firefox, Internet Explorer 11, Opera, Safari) to see if this makes a difference. If the icons appear OK in a different browser, then try temporarily disabling all extensions in your Chrome browser to see if this helps.
(3) Check that there are no global CSS font rules on your web page which might be setting a custom font for all elements which is overriding Juicebox's own icon font.
(4) A further cause of your problem might be incorrect or missing MIME types for the font files on your web server.
If this is the case, then you may have to contact your web host to ask if they can add the font file types (.eot, .svg, .ttf, .woff) to the list of known MIME types (so that browsers know what to do with them).
If you continue to experience difficulties, I'd be happy to help further but I'd really need to see the problem live on your web server (to at least try to determine whether the problem is server-side or client-side) but I notice that your gallery is currently password protected.
I hope that my notes above point you in the right direction but if you need any further assistance and are happy for me to view your gallery, please let me know and I'll send you an email where you can send me your web page's login details.
Thank you.