How do i fix this collision box issue?

i am running into this problem

the issue happens at 0:16 and at the end of the video.

youtu.be/AT9PxmuGB2g

this is the player's collision box:

I'm not sure how to prevent it. The player size is 16x16, its mask is 12x13px

the platform is a tileset and each tile has a mask 16x16 in size.