I got my first 3D printer a couple of days ago ( anycubic photon ) and have been printing some smaller models for testing without any problems.

Now I am trying to print some bigger models which results in the first couple of layers ( not the bottom layer ) getting an "island stepping" effect.
Is this due to, weight problem ( not hollow enough ), room being too hot, bottom layer timing or maybe normal layer timing in general?

Would really appreciate if some one could help

Test print 1/3 size - No problem

1/1 size print - Ugly print