update duplication

[SamSungtwo]

The Google play store shows me 2 applications which require an update through the Google play store.  The updated version for both Google and Twitter have the same version that I am currently running. I received an update from Samsung play store for Twitter only.
Why is the Samsung store providing Twitter updates when it can be received on the play store?

Below Samsung store offering. 

[Halston]

Hi SamSungtwo,
It is normal that the third parts apps updates are available both on the Galaxy store and Google play store.
It is Samsung's online store for downloading Android apps for its Galaxy devices. Galaxy Apps is an app store that comes bundled on Galaxy and Gear devices. The Galaxy Apps store is also a go-to source for perks and deals offered only to Galaxy and Gear users.

[SamSungtwo]

The flaw is I am being asked to update when the version is the same as what I have already have on my phone.