Html plugin error with correct code

[jtbc90]

3 days ago I started to set up some code in my site https://www.gamers-eye.com/ to update prices with other’s site api. Everything was fine but now all my code looks like a sad page in grey background instead of a text. It’s not the code because if i copy and reput in inside the plugin everything works well. What’s the problem? Is there any solution? Cause I’m setting up 200 code like this and I don’t want to remake them 2 times per week.