Haha... that looks a lot like mine.
But I have around 0.1 in flatness though. Did several mesh measurements starting with different bed temperatures from room temprature to 100C and it had basically the same shape.
Didn't change much.
As it stays around 0.08-0.1 and next step in my build will be to start initial prints I haven't investigated more.
If it seems to be a problem I will do.