Hi everyone. I noticed that the spring young leaves of the Chinese elm became deformed, this can be clearly seen in the photo. He wintered in a shelter, is constantly outdoors, and this is the first time I have encountered this.
I fertilize 18:18:18, grow it in an inorganic substrate like all my other trees. There are no visible pests and it doesn't look like a spider mite. Maybe this is a lack/excess of any microelement? Or is it a fungal or viral disease?
Or did I overdo it with the fertilizers concentration while the leaves were still fragile?

The tree looks healthy to me.