Not a perfect fit on Android phones

Hi,
if we try the theme on an android device, like Huawei P8 or Samsung Galaxy Grand Prime, the theme isn't a perfect fit on the screen.
For instance the title "BEAUTY THEME" is displayed as "BEAUTY THEM". If you shrink the screen with your fingers it fits perfectly, but it seems that there's something wrong(?) and it's displayed bigger than it should.
Have you checked the theme recently on a mobile device?
Do you have any idea what may be causing the issue? What should we check in the template files/css?
Thank you in advance!

PS : Here's a link to our development in-progress website, where the same thing happens as well: dev.littlecookintips.com
PS2 : We uploaded in image from Chrome, having selected a Samsung device so you can see the issue with the missing text on the right.