Quality lost on a projector

I just got a new budget projector yesterday konka b12. You've probably never heard of this but that doesn't matter.
So the projector supports 1080p, so it looks crisp and nice at its OS. But when I plugged in my firetvstick HD, it works but everything looks pixelated and fuzzy.

I already switched the resolution to 1080p 60fps and using 8 bit color depth

I really don't know what the issue here is because the projector looks nice when it isn't using the firestick. Please help.