I do not recognise the app with Shield and Flash that you call “Securiti Android”. Where did you download that from?
I cannot see anything like it on Google Play app store.
Where did you download “Avast Mobile Security” app from?
Was it Google Play store?
You should not have 2 antivirus apps active on a device.
If you installed Avast from Google Play Store then that should be good to use.
I do not know the other one. If it was downloaded from somewhere unsafe, I would remove it, or at least disable it.
Note I am not an Avast Team member just another user.