Problems with Theme Alignment

Hi, I am using the theme Catch Evolution for my blog: http://www.ourdogjourney.com I noticed that for some reason on my mac mini computer using a 50inch monitor that when I zoom out on the page in whatever browser I am using the website alignment gets messed up and all the content shifts to the left. This is very frustrating as on my Macbook Pro when I zoom out everything stays put as it should. Is there any way to fix this? I really like the theme and considering purchasing the Pro Version I just want to make sure the theme will function the same on all screens. Thanks!