Firstly please find the difference between the Font styles of Lato and Oswald. And then check the font of the site. You will need to check, is the site loading in Oswald or it is just showing Oswald in Coding (Inspect Element).
From the screenshot you shared shows that you have not paid attention to the loading of the font style, as in the screenshot the content you mentioned is in “Lato” font not in “Oswald” font despite it is showing “Oswald” in the coding.
I have attached the screenshots of the site in both Lato and Oswald fonts. At first, site loads in Lato font, after refreshing the page it then loads the content in Oswald font and it happens on all laptops, on all browsers including Incognito or Private windows (Sorry for repeating this sentence many times).