You have to make sure the tab page is actually selected before dropping controls, otherwise the controls are really added to the form and will display regardless of which page is active. Demonstrate this by selecting the new controls and moving them until they are not positioned over the tab control. They are on the form.
Takes a little practice - drove me nuts for a while until I got the hang of it. Click the specific tab then select control to drop. As you move over the tab control the page should turn dark.
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My guess is that it's not actually on the tab, click the customer text box, hit CTRL-X to cut it
Click on the tab labeled MAIN
hit CTRL-V (paste)
it should paste it in the upper left corner of that tab, then you can move it about. I'd imagine you chose the customer from a field list and just dragged it to your tab control which doesn't actually put it on the tab control it just lays it on top thus it seems to persist through tab changes.
Thank you very much now im really mad at myself that seemed so obviously easy WOW!!!