How do I fix my jump?

So I have a couple of animations for a character that uses the platform behaviour but for some reason it wont jump on certain frames. I've checked the collision points on all the frames but it's the same frames every time. All the other frames work fine and make it jump okay.

Is this a problem with the animation or an I just not seeing something wrong?

Without seeing your .capx it would just be guesswork.

CMuskett

This is most probably caused by collision polygons or origin points.

Use a different invisible sprite with Platform behavior and pin your character to it. There was a similar post just 2 days ago: