I've had this problem for a while now, and it's still not fixed. I only have this problem with roll20. When I'm typing on sheets (d&d 5e) both NPC and PC, it sometimes deletes what I'm typing, often the last action. So for example, if I type "Line one, Line two" it may delete some of it leaving me with "Line one, " with in less than a second after I typed it. I have a decent computer (It's not a laptop) I use chrome, with the sheets popped out on their own tab. I am not currently using Jumpgate.