The problem with the Blocksy theme

Hello, I have a problem with the search page in the topic Blocksy. The answer from the developer of the theme.
“Regarding the “Some problem with the search closing button” – this is caused by a plugin you are using (Preloading Plus).
For some reason it is changing the transition of the body element and this affects our search modal transitions when it opens.

I would recommend you to contact the plugin author and ask to take a look at this case and maybe apply their transitions more accurately.”