Keyframe stills exists after Alt+I?

I chose all the bones and deleted some keyframes with Alt + I, blender told me 126 keyframes were deleted. But they still showed in timeline:

frame 79 and 104
STICKd.blend (4.81 MB)

You have grease pencil sketches on frames 79 and 104

Oh my. Grease pencil… I got it. Thanks man!