I use the view [huisje-huren-top 3-2 personen op-homepage] and changed the button style (borders and color) but it doesn't match the result on the home page.
I see that the first 'Bekijk het huisje' button is added using the Toolset's 'Button' block, while the second one below is added using the Stackable's 'Button' block.
To make this button look similar to the one from the Toolset, you can remove the background color from this block's settings, adjust the text color and include some border.
( screenshot: hidden link )
For the most accurate and updated information about Stackable's block styles, you can consult its official documentation and support.
I'm not sure exactly why the Stackable's button blocks styles are not getting applied correctly and you can consult their official support team to troubleshoot this.
As a workaround, I've added the following changes to make that button show in an border outline style:
1. In the 'Button Group' block's settings, I've included a custom class 'custom-outline-button':
( screenshot: hidden link )
2. And in the section, WP Admin -> Appearance -> Customize -> Extra CSS, I've included this CSS code: