Why does design go with seo url in opencart?

Question

Search Engine Optimization

I turned on the seo url in opencart and
registered the url for the product and for the category I
went into this category, I open the product and the whole layout goes. Why is that.
For the experiment, I left a link on which the design goes.
kroxatex.ru/komplect-v-krovatku-dlya-devochek/komp...
Although if you go to the main page and open this product from the main one (it is the first one in the Featured Products block), then everything is ok with the layout.
What's the matter, how to set the correct url links?
why in the category of goods the goods have such an address:
kroxatex.ru/komplect-v-krovatku-dlya-devochek/komp...
after all, it should be like this
kroxatex.ru/komplekt-v-krovatku-angel-dream