embeded forum iframe keeps adjusting height

icestormz

I embeded a universal forum code, the iframe keeps adjusting the hight consistently not sure why, how can i fix this

Screen Shot 2021-02-19 at 12.09.17 PM.png

icestormz

from what i can tell its an issue with. postMessage

https://developer.mozilla.org/en-US/docs/Web/API/Window/postMessage

js/embed.js line 53 this function keeps getting new height if you console log e.data