Why does Adsense spontaneously expand blocks?

Question

css

Good afternoon.
I've been struggling with a problem for an hour, I've never seen anything like this before.
Adsense spontaneously expands some blocks. On the same page, one time it can be normal, and another time the block will crawl out and run into the sidebar.
Already set rigid containers - to no avail. Why does he add his own styles and set the block width to 990px? Maybe someone came across.
I am attaching screenshots below.

Answer 1

I'm wildly sorry for the question, but does anyone go to your site that they needed ad units there? )
As for the essence of your question, check if you have installed adaptive blocks - yes, they can spontaneously change their parameters depending on the screen resolution.