I think I can shed insight on a couple of your "issues"
In regards to the Circle to the left of the Logo is NOT a missing image, but a what's showing control feature, like the three line (called Hamburger Icon). The Hamburger shows or hides the TOC (table of contents) so Admin panel is more user friendly on small screens.
And the circle is a scroll lock that keeps the TOC attached to the rest of the page, so when one scrolls it does to, If you click on it it will the dot will turn colors and it disconnects the TOC from the rest of the page, so you can scroll the page, but the TOC remains in place.
About your Wish List - that is an extension and in checking the marketplace there is no update for that extension to version 1.2. There are some changes in 1.2 to the default_html5 in the previous versions, it is now called just default. This requires all the template calls to be adjusted.
This may also be your issue with the Order Summary page (a guess on my part) I think you have an extension there about order tracking.
Hopes this helps to define where to look to solve your issues.
Lee