Hey there, I'm a bit of a webmaster and have wordpress experience etc..
I took a look at the source code after posting a link on twitter and noticed you don't have any twitter cards in your meta tags, you have OG cards which work with some social medias like Facebook but not the twitter cards which sort of work with the rest.
This are the OG meta tag types that you currently have.
"<meta property="og:type"
Also add these types, the twitter cards, they give that nice card display on social media and actually increase the number of clicks greatly. They look like this.
<meta name="twitter:card" content="summary_large_image" />
Have your design team add all the relevant twitter meta tags like above here and I would suggest this one also, it gives the full-size card on twitter rather than the little box card like youtube videos do.