I didn't animate scale channel, but the fbx export has some scale animation

Hello blender enthusiasts,
Please help me with these problems, I couldn’t find a solution myself.
problem A:
I didn’t animate scale channel, but the fbx export has some scale animation. The charater’s head now stretching a little (noticeable and it looks weird) for a while.

Rig :
The character is imported from maya with its own skeleton. On top which i added rigify skeleton with transform constrains. I have no issues in blender. but while exporting (the export doesn’t contain rigify rig) to maya. the character head kinda stretches.
Please help.

Problem B:
also another problem with rigify.
when I scale the whole rig with root ctrl. the neck isn’t being scaled correctly
Resulting expansion while scaling down and vice versa. How do we fix this issue?
Thankyou,