[Users] Subtab missing problem in admin portal

Here's the steps to reproduce the problme: 1. Click maintab A, click an item in the list, the subtab is shown out. 2. Click another maintab B, then click A maintab again, click an item in the list, the subtab is missing. If after clicking maintab B, I clicked its item in the list, I can see the subtab normally, and so does maintab A.