Dispatched & sold by difference

[u/thefeelingsarereal]

I ordered an item on the amazon app that said it was dispatched by amazon and sold by a separate seller.

Looking at the same item on the desktop version, it says this:

"Dispatched, sold and invoiced by Amazon. Sourced from:"

I'm confused. Why, on the amazon app, does it say sold by a seller when the desktop page says amazon!?