Custom css / html in theme went wrong

Hi there,

I am using a theme called MH Squared Lite.
Before I did, I used Bridge with custom css
(pretty much 90% custom code, 10% theme..)

Now I switched themes, and some of the code is still present, but I can’t find it (disclaimer: I’ve taken a huge break from WordPress).

So it’s messing up my front page a bit, and I don’t know how / where to edit it.
I already threw out all of my custom css content to be sure, since I was mostly going to use this theme anyway.

Does anyone know (in layman’s terms) where I can find / alter this?

Info: https://gyazo.com/22a3f35e178c253afd54fa7deeba3148

^ The slider plugin ”Master Slider Widget / Simple Slider With Slide Info V2”

It’s loading stuff in from [somewhere], that I don’t want it to load.