Enhanced Vanilla Trees issue - two toned trees darker at the top?

[Guest deleted1800993]

Hi folks,

 

My trees look odd close-up (see attachment) . They're darker at the top, and appear to have no shadows at the base. When I get closer to them, the problem seems to disappear as the tree get's darker. I'm unsure how I managed to do this... I'm only noticing it now, after I just installed Enhanced Vanilla Trees (larger trees option). Could somebody help me troubleshoot this?