Wall corners acting weird

[HNAP_Julian_JBO]

i have joined two walls, the bottom one is overlapping the wall above,
Top wall goes strangely down (to its base offset = 0 )in the corners. 
How to avoid it?
Wall joins doesn't help.
Attached Revit 2024 file.

[vitorbortoncello]

drag up using shape handle 

[HNAP_Julian_JBO]

Dragging up (i.e.) changing walls Base offset is not an option, because I need the wall part on the 'internal' side to stay low, while 'external' side stay higher.
Modifying layers for vertical up/down flexibility is not giving good results either.

[vitorbortoncello]

Well, for a definitive solution, I believe modeling two walls with two heights and then joining them is the easiest way

[barthbradley]

Switch Join Order

Help | Join Geometry | Autodesk

[HNAP_Julian_JBO]

That is exactly how I did it.

[HNAP_Julian_JBO]

Switch Join Order makes the top wall come lower. I need the opposite:

[barthbradley]

---

@HNAP_Julian_JBO wrote:

Switch Join Order makes the top wall come lower. I need the opposite:

---

Look back at my screenshots. I used Switch Join Order to achieve BOTH conditions.  

[HNAP_Julian_JBO]

@barthbradley  it is a mystery to me how you made it work with Switch Join Order. I tried it in the video below, no luck.

[HNAP_Julian_JBO]

Any idea how come it doesn't work for me? As you can see in the screencast above.

[ridantuo]

Wall Joins should fix that 🤔 -- if this is the way.

[azad.Nanva]

Why you use the join and Overlap in height?
I can not understand?
am i missing something?

[HNAP_Julian_JBO]

Because bottom wall is only on the exterior side, see:

[HNAP_Julian_JBO]

Wall joins - very time consuming and doesn't apply throughout the Model groups of walls.

[azad.Nanva]

whach the new video.

this one: