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It's great that your site ranks within the top 5 results for "Wedding Invitations Toronto" on Google. The issue you're facing, where the title of your page isn't displaying in the search engine results page (SERP) while the domain appears twice, might have a few potential reasons.

Firstly, Google sometimes alters the displayed title in the SERP to better match the user's search query or to improve click-through rates. It might dynamically change the title tag if it feels the original one doesn’t quite match the user's intent.
As on our client's website https://networthandage.com/ sometimes the SEO title automatically gets changed. so you don't need to worry if you're writing the SEO title and changes automatically.

is your post title and your SEO title are different then also the post title will display in serp.

@talentwide yeah, google doesn't mean that article written on the Artificial intelligence will not rank. Any article which solves a user query can rank on google. It all depends on the Artical quality and user intent for the specific keyword.
In this world where Artificial intelligence in involved in every field how can google ignore the Artifical Intelligence Topics ? Here is the details of How Artificial Intelligence is changing the World of photography