It has something to do with bump mapping. Looks like it's not implemented correctly in 10th Anniversary Mod. It's the effect that makes Arokh and water in-game look beautiful. Turn bump mapping off in Riot Engine options and the glitches will go away but turning off stock effects really defeats the purpose of a graphical mod.
"When a human being takes his life in depression, this is a natural death of spiritual causes. The modern barbarity of 'saving' the suicidal is based on a hair-raising misapprehension of the nature of existence." - Peter Wessel Zapffe