I noticed that the following Eldritch Invocations can be found on the mobile app but not the website - for reference, the only book I have purchased is the PHB

-Aspect of the Moon
-Cloak of Flies
-Eldritch Smite
-Ghostly Gaze
-Gift of the Depths
-Gift of the Ever-Living Ones
-Grasp of Hadar
-Improved Pact Weapon
-Lance of Lethargy
-Maddening Hex
-Relentless Hex
-Shroud of Shadow
-Tomb of Levistus
-Trickster's Escape

I was wondering why these don't show up - if they're in a book, could you tell me what one? Lance of Lethargy and Grasp of Hadar would be fitting for the concept I have

I see those invocations in my browser when pointed to https://www.dndbeyond.com/classes/warlock on both PC (Opera) and Android (Chrome).

I believe your problem is that you have not unlocked the Xanathar's Guide content, which contains these newer invocations. You should also have the same limitation with racial feats and many subclasses.

Ah, thanks. I knew that Xanathar's had racial feats and subclasses, but I didn't know it had new invocations. Thanks!

Hey! I bought XGtE yesterday and I still dont have Gift of the  Everlasting Ones on my Warlock. He is a Pact of the Chain. It's just not showing up on my browser. 

Does anyone else have this issue? 

Yes I have that issue as well was hoping to find a solution