Search results does not show the page title

[zhikai-aiken]

Whenever my website's users tried to search for a page or data object using Pimcore's search engine, it seems that the search results shows the page's key instead of the page's SEO title for example, which is the proper title.

As you can see from my screenshot, the search results for pages have underscores and is not properly capitalised. However, the title for data objects are showing just fine. How do I fix this?