YAML syntax error

We're currently running traefik 1.7.12 as a DaemonSet in a Kubernetes cluster v1.15.3. Yesterday, it was the first time we modified the pods for our staging environment, however after the pods started again, traefik has been logging this error message:

time="2020-06-11T23:21:32Z" level=error msg="yaml: line 5: could not find expected ':'"
time="2020-06-11T23:21:32Z" level=error msg="yaml: line 5: could not find expected ':'"
time="2020-06-11T23:21:32Z" level=error msg="yaml: line 5: could not find expected ':'"
time="2020-06-11T23:21:32Z" level=error msg="yaml: line 5: could not find expected ':'"
time="2020-06-11T23:21:32Z" level=error msg="yaml: line 5: could not find expected ':'"
time="2020-06-11T23:21:32Z" level=error msg="yaml: line 5: could not find expected ':'"
time="2020-06-11T23:21:32Z" level=error msg="yaml: line 5: could not find expected ':'"
time="2020-06-11T23:21:33Z" level=error msg="yaml: line 5: could not find expected ':'"
time="2020-06-11T23:21:33Z" level=error msg="yaml: line 5: could not find expected ':'"
time="2020-06-11T23:21:33Z" level=error msg="yaml: line 5: could not find expected ':'"
time="2020-06-11T23:21:33Z" level=error msg="yaml: line 5: could not find expected ':'"

This is quite strange because the configuration file used is the same in production (we have restarted multiple times those pods with no errors).

This is our config file, it's a ConfigMap:

apiVersion: v1
kind: ConfigMap
metadata:
  name: traefik-config
data:
  traefik.toml: |
    # traefik.toml
    defaultEntryPoints = ["https","http"]
    [entryPoints]
      [entryPoints.http]
        address = ":80"
      
      [entryPoints.https]
        address = ":443"
        [entryPoints.https.tls]
          sniStrict = true
          minVersion = "VersionTLS12"
          cipherSuites = [
            "TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384",
            "TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384",
            "TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256",
            "TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256",
            "TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305",
            "TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305"
          ]
      [entryPoints.traefik]
        address = ":8080"
      [entryPoints.ping]
        address = ":8082"
    [kubernetes]
    [ping]
    entryPoint = "ping"
    [api]
    entryPoint = "traefik"

I've done some research but wasn't able to find anything related to this problem.

Any help is appreciated, thank you!