On your browser go to the website open your developer console or inspect element , it will tell you if its used a fallback font , or failed to load a font , could be a format issue too. You actully have a number of issues ranging from js errors and as you can see for me it used a fallback font and im on chrome , hp :
Mixed Content: The page at plumbwize.ca/' was loaded over HTTPS, but requested an insecure script plumbwize.ca/wp-content/plugins/techwyse-form/inc/js/jquery-1.3.2.js?ver=4.8.2'. This request has been blocked; the content must be served over HTTPS.
jquery-migrate.min.js?ver=1.4.1:2 JQMIGRATE: Migrate is installed, version 1.4.1
6Slow network is detected. Fallback font will be used while loading: <URL>
(index):644 Uncaught TypeError: $ is not a function
at (index):644
(index):796 Mixed Content: The page at plumbwize.ca/' was loaded over a secure connection, but contains a form that targets an insecure endpoint plumbwize.ca/wp-content/plugins/techwyse-form/forms/mails/mail.php'. This endpoint should be made available over a secure connection.
(index):871 Mixed Content: The page at 'https://www.plumbwize.ca/' was loaded over HTTPS, but requested an insecure image 'http://www.plumbwize.ca/wp-content/plugins/techwyse-form/forms/template/img/rolling.svg'. This content should also be served over HTTPS.
main.js:113 Uncaught ReferenceError: svg4everybody is not defined
at main.js:113
(index):1302 Mixed Content: The page at plumbwize.ca/' was loaded over a secure connection, but contains a form that targets an insecure endpoint plumbwize.ca/wp-content/plugins/techwyse-form/forms/mails/mail.php'. This endpoint should be made available over a secure connection.
(index):1376 Mixed Content: The page at plumbwize.ca/' was loaded over HTTPS, but requested an insecure image plumbwize.ca/wp-content/plugins/techwyse-form/forms/template/img/rolling.svg'. This content should also be served over HTTPS.
(index):1651 Mixed Content: The page at plumbwize.ca/' was loaded over a secure connection, but contains a form that targets an insecure endpoint plumbwize.ca/wp-content/plugins/techwyse-form/forms/mails/mail.php'. This endpoint should be made available over a secure connection.
(index):1726 Mixed Content: The page at plumbwize.ca/' was loaded over HTTPS, but requested an insecure image plumbwize.ca/wp-content/plugins/techwyse-form/forms/template/img/rolling.svg'. This content should also be served over HTTPS.
(index):1 Mixed Content: The page atplumbwize.ca/' was loaded over HTTPS, but requested an insecure favicon plumbwize.ca/wp-content/uploads/2017/08/favicon.ico'. This content should also be served over HTTPS.