not sure how you counted 5th node, but i assume you can see it better then I can. It looked like the 3rd to me, from looking at the pic. Maybe 4th, are you counting the cotyledons as the first set? technically those dont count as a set.
Really though, looks just fine. Growers usually top at 3rd or 4th node. IDK what technique your trying to use, sounds like your aiming for a short bushy plant? Or are you thinking about doing a scrog? either way, your doing fine. I am not a fan of multiple toppings. not saying it doesn't work, just that its not for me. good luck!