AWS VPN Customer Gateway configuration with CISCO ASA

I'm attempting to set up a site to site tunnel between an office and an AWS VPC as so

I've done the hard bit and got it all working but for some reason when I apply this config it removes the two existing VPN tunnels I already have set up.

I want to deploy this in a few different geo locations on production ASAs that also have existing VPN tunnels.

Here is my ASA config before

Here is my ASA config after

A apologise in advanced for using the

DM_INLINE_ 

Any help would be extremely welcome. I really don't understand why my existing tunnels are vanishing.