Icons-only Task Manager Showing Redundant Icons For Dolphin and Firefox

In Kubuntu 19.10, my main display has a panel that features the Icons-only Task Manager widgit. Most icons work the way I want: after clicking an icon, that vary icon becomes my way of returning to that already launched application (when other windows lay atop).

However, when I click the dolphin or firefox icons, a redundant icon (of those application, respectively) gets appended to the Icons-only Task Manager widget and it is that 2nd (redundant) icon that I must use to switch back to that task after other windows have focused in front of it.

Normally, when I right-click on a launcher-icon I have the context-menu option of being able to "unpin that icon", this is not the case with Firefox or Dolphin. Each time I click the dolphin icon, it launches a new window of dolphin instead of switching to the previously launched window of dolphin.

I'm confused as to why these two application's task-manager icons act differently than all the others. To me, there is nothing special about Dolphin or Firefox that I would want them to behave differently than any other launched application.

What setting am I overlooking here? How can I get these two applications to act like all the others: one icon per application and each application is pinable and unpinable?

Update: I noticed that my issue was only happening with the default KDE panel (the one that I modified right after install) and was not happening on the panels I created from scratch (for my external monitors).

I fixed the problem by deleting that bad default panel and created a new one from scratch. There may have been a setting I could have changed to fix that default panel, but replacing it is how I fixed it.

Update 2: Now, when I hit the super key, it doesn't open the Application Launcher anymore. Consequences! Now what?