I created this post so I can ADD PICTURES in support of a Feedback Tracker issue.
(You cannot add pictures to comments, so I'm doing it the hard way.)

ISSUE #407
http://www.reallusion.com/FeedBackTracker/Issue/It-s-too-easy-to-create-a-duplicate-Keyframe-in-the-timeline

SHORT SUMMARY:
Clicking *near* an existing keyframe will turn it green, so it looks like it is selected, but in fact you can be a couple frames away, so any "editing" will result in a *new* keyframe rather than modifying the existing one.  This is probably more likely to occur when you are "zoomed out" on the timeline.

NOTICE:
a) The Frame counter
b) The keyframe that turned green
c) The new keyframe that appeared when I moved the avatar's fingers, so now his hand "jumps" from the old pose to the new pose in the span of two frames

---

iClone 7... Character Creator... Substance Designer/Painter... Blender... Audacity...
Desktop (homebuilt) - Windows 10, Ryzen 9 3900x CPU, GTX 1080 GPU (8GB), 32GB RAM, Asus X570 Pro motherboard, 2TB SSD, terabytes of disk space, dual  monitors.
Laptop - Windows 10, MSI GS63VR STEALTH-252, 16GB RAM, GTX 1060 (6GB), 256GB SSD and 1TB HDD