Question faulty flow of the forum elements on display

I have just upgraded from Kunena 4 to Kunena 5 and the display of the elements is distorted, see the attachment. The issues displayed in the attachment are:

• missing to menu elements (just an inactive pull-down arrow is displayed)
• duplicate user menu icon and menu on the left of the top menu
• missing separating elements -- dashes; only the first one is present
• vertical arrangement of the posters (users' details) and messages
• vertical arrangement of the links to previous and next messages
• overlapping elements: date and post

I kinda feel that the reason for all these misplacement is one and single, but I cannot think of any.

The strange thing is that both templates available default display the elements in the same manner.

What should I try to set or change, please?

Try the crypsisb3 template.

If not working, then change it back to crypsis, and enable Load Bootstrap option.

I logged into the site on the evening and there were no glitch in displaying the elements. I don't understand. Can there be any delay time between changing the template parameter and displaying the page?

Maybe cache. From joomla or by your hosting company or cloudflare ect.