Dimensions not correct

As a newbie, I drew a schematic to remodel a small office building.   I have set the dimension to "foot" in both preferences.  Also set to Archecture 0-1/2" in the current drawing preference.

I drew the schematic so the distance between 2 ticks equals one foot of wall.   When I used the dimension tool, it said the wall was 24'2".   The wall is 29 ticks so it should read 29'.   What am I doing wrong?    How do I set the dimension so the distance between two ticks 1 ft?

Thank you in advance.

Hello and welcome!

Check from Options/Applcation Preferences and Current Drawing Preferences, that the unit is right, in your case foot.

Instead of Suggestions and Feedback, which is more to development issues, better section would have been for example Troubleshooting.

What do mean with tick? The points from the grid?
I'm not an expert in feet and inches, as I'm European. But as far as I know the standard for architectural is inches. And in LibreCAD settings you can't combine feet with architectural.

I have made some sample drawings a while ago. For proper set up you also have to consider the intended print scale.
arch_inch_1_48_letter.dxf
arch_inch_1_96_letter.dxf

You can use them directly or study the settings and adapt them to your own needs.

Perhaps something in: https://forum.librecad.org/template/NamlServlet.jtp?macro=search_page&node=4499512&query=inch