Why does it hate lastpass so much?

I am running avast for Mac along with Lastpass (Lastpass is a password management application).
But most of the time, avast keeps on reporting false notifications on Lastpass’ actions. Because of this, I am even tempted to remove avast and get rid of all those annoying notifications once and for all.

http://i.imgur.com/VPaZUPql.png

Do you have any suggestions?

I TRUST lastpass with all my passwords, so don’t ask me to stop using their service. I have been using lastpass for more than 3 years and I am a very satisfied customer.