Why would there be more channels and/or better stream availability in one app vs another?

Been using primestreams after helix exploded.

Fairly decent service but I've noticed something strange with their playlist. If I use their Adult category as an example, I get 98 channels through the Smarters App on my iPhone but if I use Tivimate on my Shield, I only get 22 channels. Channel 3100 is available in Smarters but not in Tivimate.

In addition, a stream might be down on Tivimate but not on Smarters.

Anyone have any guesses why this might be happening?