Keyframes keep showing up in Actions

[Gakk42]

If you watch the video, i delete the mouth keyframes from SHOCK action. But they keep coming back and stopping my shock animation. HEEEEELLLLLP!

https://streamable.com/sp453q

[Víctor Paredes]

I'm not sure, but it looks like you are manually adding those keyframes.
If I'm not wrong, you are using the Transform Bone tool. With that tool, every time you click over a bone, the software adds a keyframe to it (it will be rotation, scale or translation depending on where you click), but you also have "Auto-freeze keys" checked on the timeline. That means every time you animate one bone, all the bones of the character will receive keyframes on rotation, scale and translation.
Using the Select Bone tool should work fine in this case.

I hope this helps.