Every time i wirte an effect it messes up and writes a bunch of nonsense

[Wi Fi Master Jordan]

every time i wirte the effect it makes it unreadable with a bunch of % and 2s in the middle and it runs off the page how the heck do i fix this i wanna make a card

[Ярополк Пономарёв]

The editing has gone crazy here.

<div><br></div><div>Observe: TESTING TESTING 123</div>