The Photos and Album tabs in the Photos app are just different ways of looking at the same photos, so your photos should either show in both tabs or neither.
Try closing the Photos app via the iPad's multitasking bar and then do a soft-reset and see if they still show when you re-open the app. To close the Photos app : double-click the home button to open the iPad's taskbar, and then swipe or drag the Photos app's screen from there up and off the top of the screen to close it, and click the home button to close the taskbar.
To a soft-reset : press and hold both the sleep and home buttons for about 10 to 15 seconds (ignore the red slider), after which the Apple logo should appear - you won't lose any content, it's the iPad equivalent of a reboot.