What am I doing wrong when I update my articles?

[Nicoletta C.]

I keep having poor URLs in terms of Core Web Vitals, but my Speed Score on Lighthouse is 99.
Google Console has detected 111 poor URLs, but I have a total of 250 URLs on my blog. Why aren't all of them showing up on Google Console?
I can see that the main issue lies with the LCP being too high within a group of URLs.
My question is, why? What am I doing wrong?
I create all my images on Canvas Pro, and then I optimize them using tinypng.com. Additionally, I use the Smush plugin.
Now, what should be the appropriate image size for a blog on WordPress?
Please help me understand what I'm doing wrong.
Feel free to ask me any questions.
Thanks.