Ok. Found problem.

I wrote this custom css. Deleting it, cls crush to 0. Do'n't know what of these was the cause. Only know cause was here. 

.post-entry img {
    max-width: 100%;
    height: 200px;
    width: 300px;
}

.wp-block-gallery.has-nested-images figure.wp-block-image figcaption {
    background: linear-gradient(0deg,rgba(0,0,0,.7),rgba(0,0,0,.3) 70%,transparent);
    bottom: 0;
    color: #fff;
    font-size: 18px;
    left: 0;
    margin-bottom: 0;
    max-height: 60%;
    overflow: auto;
    padding: 0 8px 8px;
    position: absolute;
    text-align: center;
    width: 100%;
    box-sizing: border-box;
}

.blocks-gallery-caption {
    color: #555;
    font-size: 18px;
    text-align: center;
}

/* mette lo spazio sotto le didascalie */
 .post-entry p{
    margin-top: 35px;
}

OK. I found that modifying this parameter:

and setting to a larger value, cls crash down from 665 to 95.

1400 container is too large. But if I set it smaller... cls grow up.

Pls help to set around 1100 value. Without cls growing up. :)  

That's mobile.

Check desktop, instead. :)

How can I make it lower?
0.565 cls seems high.

Ty a lot.