The problem is that the page already (and appropriately) inserts the h1 heading based on the page/post title, but then you’re manually inserting an additional heading:
<h1>Welcome to MSInterim – We can help you!</h1>
Would you be doing this because you don’t actually want “Company Presentation” to appear on page, but only be the slug (yoursite.com/company-presentation) of the page?
In that case, you can make “Welcome to MSInterim – We can help you!” the actual title when editing the page, and just below you’ll notice that you can manually edit the URL slug.
You’ll want to remove the following CSS:
.entry-title {
display: none;
}