Changing spreadsheet value not working as expected

[ve9gj]

OS: Ubuntu 18.04.4 LTS
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.18.4.
Build type: Release
Python version: 3.6.8
Qt version: 5.9.5
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: English/Canada (en_CA)

Hi
FreeCad newbie here wondering what I am doing wrong.

I have been working on a more complex project for 3D printing and I started using the spreadsheet tool to set dimensions.
If I change a dimension in the spreadsheet my whole project blows up. I am sure I have done something wrong and this has happened to me a couple of times so far. The attached file is what i have been working on in Part design to give an example.
Look at Sketch018. everything looks OK
Now I change the value in spreadsheet row 12 "Side Wall Thickness Dove" from 10 to 15 it seems to break a lot of sketches.
Spreadsheet row 1 OuterW increase by 5mm as it should.
Now if I view Sketch018 it looks like it is on a different plane and my project is now borked big time.

Any suggestions on what i am messing up?

TIA
Glenn

[TheMarkster]

This is why you should not be attaching sketches to faces. For example, instead of attaching Sketch018 to that face attach it to the xy_plane and set it's attachment z offset to Spreadsheet.OuterH + Spreadsheet.BotThick. There are other sketches that probably need to be similarly re-attached to one of the major planes. Fillets are also somewhat finicky, but I think your main problem is the topological naming issue.

[chrisb]

your main problem is the topological naming issue.

See topological naming problem.

[ve9gj]

Thanks for looking at it. I thought attaching a sketch to a face was the proper way to do it. Part of learning I guess.

Glenn