There may be political motive to this.

Why is Telegram X issued by "Telegram Messenger LLP" while the original Telegram is issued by "Telegram LLC"?

Telegram LLC, which issues the original Telegram app on the App Store has been undergoing litigation with regards to its ownership. It is based out of Russia and a company called UCP with Krelim ties who 'bought' VKontakte has been suing Durov for full Telegram ownership pursuant to VKontakte 'purchase'.

Telegram Messenger LLP however is based in London and seemingly wholly owned by Durov crew. In 2014, Telegram Messenger LLP launched Telegram HD, a separate app from Telegram-LLC-issued-Telegram. Now it is launching Telegram X , another separate app (which was until very recently Challegram, an open source Telegram client, winner of Telegram contest, and purchased by Durov) .

Draw your own conclusions.

EDITED for clarity and details

https://themoscowtimes.com/articles/the-telegram-lawsuits-ex...

http://www.ewdn.com/2014/07/29/pavel-durov-has-cloned-telegr...

https://rusletter.com/articles/ucp_requires_to_recognize_tel...

http://www.frandroid.com/android/applications/securite-appli...