Second animation layer causes y axis growing automatically, is it because of avatar mask?

Once i added new animation layer which contains just an empty state , my character’s y axis is keep on getting increased.

i have tried removing avatar , changing additive and override. nothing helped!.

whats wrong with this?

The issue is because of apply root motion checked. Disabling it causing few gravity problems with character.

Selecting update mode as Animate Physics in animator solves the problem. but animation not getting working in additive mode , override mode triggers animation but causing some camera i need to use additive mode.

can anyone help me how to trigger animation with additive mode and root motion applied ?