Updated to Hyper from Hyperterm, and this happens when I scroll up and then down.

Started appearing for me too once I tried the new split screen feature. Could be unrelated, though.
I have experienced this as well. A few things I've noticed:

I've noticed that screens that experience this issue will also multiply values pasted into Hyper. You can paste a simple string like onefoo and you'll end up with 12 copies of it with a single CMD+v.
I've primarily seen this bug when running Jest. I've noticed additional oddities every time Jest "clears" the window for each run (e.g. – previous runs are only partially cleared/cut off). I'm wondering if Hyper struggles with Jest's approach to clearing output.
@dcalhoun did you ever find a resolution? Jest watch mode is unusable with hyper currently 👎
This issue presents to me any time I try to scroll further than the bottom of the screen - I love Hyper, but it's a massive drag dealing with this.
@jbaxleyiii no, this is still very much an issue, even within 1.0.0.
@dcalhoun dangit. @rauchg any pointers on where to look for a fix to this?
Is this the same issue as #1008?
I can confirm I have seen both issues. #808 I'm experiencing very regularly, #1008 more infrequently.
This happens to me when I set vibrancy - specifically, use hyper-one-light theme with enableVibrancy: true, and scroll to the bottom of the window.
OS version and name: 10.12.5 Sierra
Hyper.app version: 1.3.3
Hey there, please try again with the new Hyper v2 release and open a new issue if the problem stills exists. Thank you!
Most helpful comment
Is this the same issue as #1008?