Hi Arthur,
I looked at your page. On the home page I don't see anything in sidebar a and hot offers is in top a.
eptest3.bbttest.com/?tp=1 I checked an interior page
eptest3.bbttest.com/training/?tp=1 And everything is as you described, but there's no way to tell if there's a module missing from the front end.
On the security page
eptest3.bbttest.com/capabilities/cyber-security/?tp=1 You don't have any modules at all activated in the sidebar position so there's no way to tell what's supposed to be there.
I think it's just a complicated setup and you might have to work through it. Assuming the template is not causing you problems.
You should have one Hot Offers module assigned to the top-a and create a second one to appear in sidebar-a. Assign the one in top-a to the home page only. Assign the second copy to sidebar-a and specify which pages it goes to. CHeck to see if it's set up this way.
If you can solve the problem with that one, it will be less confusing to work on the stacking problem.
Let me know if you can get the hot offers problem solved.
Ed