This is what I got today while navigationg agoda.com
Here you can see same content but different presentation. Does this help user?
It is considered best practice to keep navigation and other similar elements consistent throughout a site. Consistent navigation helps the user know where they are within the site at a glance and navigate with ease. Moving links and changing icons causes confusion. It's possible that particular site could be rolling out a new design or performing some sort of A/B testing, but it is definitely not best practice to change your navigation that much within one site.
For more reading, see #8 here: https://www.nngroup.com/articles/top-10-ia-mistakes/ and also: http://www.uxbooth.com/articles/the-rules-for-modern-navigation/
Best practice dictates main menus are one of the elements that NEEDS to be constant across all your pages. It is the one thing users can rely on constantly to not change. This way they can track where they clicked and in what section of the website they are.