The Twitter app for Nokia X got a bump that brought it up to speed with the standard Twitter for Android app. Before this time, the Twitter app in the Store (formerly Nokia Store) was a few steps behind what obtains in the Play Store. A little bit of insight into why: Android apps available in the Store are often optimised for the Nokia X, so that they run faster and better on low-end hardware. Often this means that they are not the latest version of the standard apps in the Play Store, but it also means that they run much better on the Nokia X range devices than their Play Store counterparts do.
The Twitter app for Nokia X now has a version 5.10.0 update, which is the same version available in Play Store. You should get an update alert on your Nokia X phone.