Sometimes the about version may show the incorrect version in Aria Operations 8.18.x after upgrading.
For example, if it was upgraded from 8.17.2, it may still show that version even though it is on a version of 8.18.0.
Clearing browser cache for the webpage does not resolve the problem.
Aria Operations 8.18.x
Rebooting the Aria Operations cluster has helped resolve this if clearing the browser cache did not.