My Mac keeps changing its DNS to 127.0.0.1

My Mac keeps changing its DNS to 127.0.0.1 and sometimes the internet just stops working (and I know 127.0.0.1 is localhost) and I have to change it back to 1.1.1.1. I have started a web server on my Mac before with Apache but I stopped it and I have messed with my hosts file before. Any clue why my Mac is doing this and does anyone know how to fix it?

$ sw_vers
ProductName:    macOS
ProductVersion: 11.2
BuildVersion:   20D64

$ scutil --dns
DNS configuration

resolver #1
  search domain[0] : cable.virginm.net
  nameserver[0] : 127.0.0.1
  flags    : Request A records, Request AAAA records
  reach    : 0x00030002 (Reachable,Local Address,Directly Reachable Address)

resolver #2
  domain   : local
  options  : mdns
  timeout  : 5
  flags    : Request A records
  reach    : 0x00000000 (Not Reachable)
  order    : 300000

resolver #3
  domain   : 254.169.in-addr.arpa
  options  : mdns
  timeout  : 5
  flags    : Request A records
  reach    : 0x00000000 (Not Reachable)
  order    : 300200

resolver #4
  domain   : 8.e.f.ip6.arpa
  options  : mdns
  timeout  : 5
  flags    : Request A records
  reach    : 0x00000000 (Not Reachable)
  order    : 300400

resolver #5
  domain   : 9.e.f.ip6.arpa
  options  : mdns
  timeout  : 5
  flags    : Request A records
  reach    : 0x00000000 (Not Reachable)
  order    : 300600

resolver #6
  domain   : a.e.f.ip6.arpa
  options  : mdns
  timeout  : 5
  flags    : Request A records
  reach    : 0x00000000 (Not Reachable)
  order    : 300800

resolver #7
  domain   : b.e.f.ip6.arpa
  options  : mdns
  timeout  : 5
  flags    : Request A records
  reach    : 0x00000000 (Not Reachable)
  order    : 301000

DNS configuration (for scoped queries)

resolver #1
  search domain[0] : cable.virginm.net
  nameserver[0] : 127.0.0.1
  if_index : 6 (en0)
  flags    : Scoped, Request A records, Request AAAA records
  reach    : 0x00000000 (Not Reachable)

$ cat /etc/resolv.conf
# macOS Notice
#
# This file is not consulted for DNS hostname resolution, address
# resolution, or the DNS query routing mechanism used by most
# processes on this system.
#
# To view the DNS configuration used by this system, use:
#   scutil --dns
#
# SEE ALSO
#   dns-sd(1), scutil(8)
#
# This file is automatically generated.
#
search cable.virginm.net
nameserver 127.0.0.1