Dimensioning Lines in Sketch View Gives Different Dimensions

[patrickKYHHB]

Very straightforward bug in Inventor 2025.3.1

Two dimensions going off the same parallel lines/points give two different results. The size is already implied with constraints/dimensions outside of the screenshot below. When adding a reference/driven dimension (for my own sanity check) I got the 0.068" dimension shown, but knew I designed this part larger than 0.1" thick. I added a second dimension without placing it and saw the exact dimension I was expecting.

I've had this happen multiple times now and didn't think much of it until I was stacking dimensions for multiple parts, manually calculating manufacturing tolerances, and knew this specific dimension that is critical seemed off.

Why can't I trust the dimensions in my sketches to be correct? 

[SBix26]

Can you post the part here?  I've never seen this happen in more than twenty years using Inventor, and I'm wondering if it is a file corruption or something very unusual happening in this sketch.

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Sam B

Inventor Pro 2026.1 | Windows 11 Home 24H2

[hkilic896XF]

Not unusual; it always happens for the first time of attaching any driven value dimension. This is the tiniest issue of 2026.1 ..😊 

[johnsonshiue]

Hi! This is a bug. I believe either there is a corrupted parameter or the display state of the driven dimension is outdated. If you go to Manage -> Rebuild All. Does it help update the dimension value? Also if the driven dimension is deleted and recreated, does it work better?

Please share the ipt file here. I would like to understand the behavior better.

Many thanks!

[patrickKYHHB]

Another one. File attached, this part has been created, saved once, but never closed and reopened. I saved a second time as a save-as for this upload, and it still shows the dimension. Look in Sketch 5. 

I couldn't upload the first file referenced because of proprietary design, but this is fine to share 

[SBix26]

When I open your part and Sketch5, or just look at the Parameters table, I see the bad value.  Anything I change makes the driven dimension re-compute correctly.

However, I have no idea how to create a problem dimension like this.  As I stated earlier, I have never seen this in twenty+ years with Inventor.

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Sam B

Inventor Pro 2026.1.1 | Windows 11 Home 24H2