Since last update all pages require multiple refreshes to load

Recently updated OpenNMS to 28.0.1 on my CentOS 8 server and now when accessing OpenNMS from my Windows workstation no pages will load completely without refreshing the browser. Some pages require two or three refreshes before they will load. Have tried FireFox and Chrome with the same results in both browsers. Any tips on where to start to find the cause of this issue? What logs to check and what to look for?

Does it behave identical on other clients as well?