make sure not to run in resizeable mode, otherwise it will glitch
if you didn't run in resizeable, i will take another look at edgeville yews and fix asap
EDIT:
as for the falador yews, if you don't like the preset options, you can always select your own area to chop trees (using the custom area selector by clicking 'custom' in the list)
if you don't want to use that, just show me which trees and I will personally add them to the list