System Information
Operating system: Linux Mint 17.3

Blender Version
Broken: 2.81 a

Short description of error
Video editor: Pushing a strip to another (in order to place together) for a while moves the animation keys of other linked ones

Exact steps for others to reproduce the error
Create a strip A in the video editor
Then another B, for example: B is an image
Create a "Transform" strip C for B, and animate it. The image moves, it works.
Then move the B strip (C follows B) and push it to A: you want to locate it next to A, to the right. It becomes red as you do. You can be seeing the animation curve as doing. Look: as you push left, it goes farther more and more.
Now strips B and C are at the desired place, both animation curve (C's) has been moving as you pushed, and it's out of time.