Why is the page height constantly growing when dumping?

Question

Laravel

Hello. Recently started learning laravel.
I decided to turn on the display of queries in the BD, I did it like this,

but after I do a dump, go echo, etc., then when I reload the page, my height constantly grows, what this is connected with, I can’t understand in any way, if I remove the dump, then everything ok, I also noticed such a problem when I draw output directly from the middleware (middleware), for example, I echo something, the same story, who had a similar problem, tell me what I'm doing wrong)