Hey, thanks for the feedback (and sorry for the late reply).
Yeah... sorry for that. All the climbing ledges were added in manually so there would be a lot of bugs like that one. Thanks for bringing it up though.
As for sometimes not climbing down ledges, did you download the recent version? The (Demo2) one. I improved the climbing code on that. If you have, then it might be ledges on the sides since I disabled those to prevent getting stuck on trees. You should be able to see the collision boxes if you press TAB.