Hello @yanade1991,
To box will adjust its height according to the length of the title . Since your title is not uniform the box appears of different sizes . However to manage the box height according to your feature section set up please use below given CSS.
For this go to Admin Panel > Appearance > Customize > Additional CSS and paste below given CSS.
.features-list span {
margin: -23px auto 0;
}
Also the tile looks messy because you have include the HTML content in the title of the post . In order to avoid such issue please include the plane text without HTML content so that you wont get such kind of issue .
Hop this helps .
Best Regards!!
Have a good day.