Hi,
since what you described with bugs interested me, since I haven't encountered problem with not being able to jump from rope on any platform. So I tested.
Unfortunately I'm not sure which jump is a problem sorry in level 3.
But in level 10 jump you describing has a problem but only if you climb to very top of the rope. It is do to how jumping works in this game. When you jump in direction you both moving in said direction and up for some time then gravity takes precedence. But if there is not enough space above you then you hit your head end immediately start to move down (possibly faster speed). That is why climbing complacently up is wrong approach. If your game is behaving normally you should be able to jump on that platform when you climb below trajectory of that arrow trap.
I hope this will help.