While it took some doing, I have been using a 3-column tab system with X theme for several years, with 1 set having to be 7 tabs. An update to the X theme several months ago knocked something loose, and I have not been able to rectify the issue. I have tried everything. The problem is that the 7th tab is permanently collapsed. The code is the exact same format as all of the other tabs, and those work fine. There is no difference in the code except the links.
You can see here that the 7th tab is completely collapsed despite having code in it. Even if the code was wrong (which it’s not), it should still appear in the tab. In fact, on this page, I have duplicate sets of the tabs because the top set used the classic tabs and the new set is using the updated version. The classic set has all sorts of formatting issues, but at least it shows the content within all 7 tabs.
The issue is occurring at preferredpump.com/training. It is password protected, so I will send that p/w in a secret note.