My application has a tab pane with many tab pages, so that it is
rendered with 2 rows of tabs.
When the first tab (in the first/top row) is the current tab, the second row begins below the second tab (in the top row).
When the second tab is the current tab, then second row begins below the third tab.
When a tab towards the right on the top row is the current tab, the second row begins below the next tab to the right, completing the second row and any remaining tabs are on a new third row.
When the last tab on the top row is the current tab, the remaining tabs are left justified on the second row, as expected.
I discovered this bug using P4A 3.4.0, which is built on jquery ui.
The problem was confirmed by the P4A developer.