Theme problem

Hi!
I have a big problem in my site.

This is my custom-theme without your plugin: https://imgur.com/fhq2s6L
And this other one is with it: https://imgur.com/Z6Dz41o

As you can see, it break my content space moving it up behind my menu even my slider.
My content class is dividen in 3 part: top,bot and mid(where is the loop) and only the last one changes it size.

any idea?

https://www.ads-software.com/plugins/wp-sliding-login-register-panel/