I've been running into this for a while now.
I'll type some in nearby chat or DMs and the entry will duplicate itself. I am using the latest Firestorm release (64-6.4.13.63251) on a Windows 10 desktop. I uninstalled the viewer for several months and used the viewer on my laptop instead. While I did not run into the same issue, running the viewer tends to overheat my laptop. So, I reinstalled it on my desktop and didn't have the issue for at least a week and now it's happening again.
I've seen that it could be a wifi issue, but both my laptop and desktop are on the same wifi. I am unable to hardwire my desktop.
Any suggestions would be greatly appreciated!!!
Thank you!