all you need to to is double-check that each field, button and label is perfecty inside each single tab.
So go in layout mode and start to delete/reposition each offending object.
Thanks for the reply.
your instructions were simple, but, I was wondering why it can't be.
I tried to test and create new layout, I inserted new tab control.
for each tab in a tab control, In tab A: I inserted a circle just inside that tab; In tab B: another square box
just inside also that tab. seems to be good, I tested again to check in browse mode. seems its
not working, still mixed up. Did I missed some options on the tab controls?
Another thing to pay attenction is that the entire tab control must be inside a single layout part ( so it can't be half in the header and half in the body )
Thank you so much for your inputs, It works.