Object axis/dimensions getting reversed

Support Modeling
1

Blender 2.82.7 in linux and I have a 93MB blend file made up of 400 objects.
I want to export the individual objects to be able to use them in another project however,
When I select an individual object (and I am careful to check the Selected Only box) and do Export/Import, this works fine but in the new scene although the axis is the same and the object measures correctly, the Dimensions of Y and Z in the Transform box are reversed.
If I change these to read correctly the object gets distorted.
In the screen shot

Screenshot at 2020-04-02 15-14-01.resized
Screenshot at 2020-04-02 15-14-01.resized1680×927 396 KB

Y should read 280 and Z should read 48.3

Any advice greatly appreciated. Thanks

PS: Just imported the next object and it is placed correctly in the new project but again the Y and Z figures in the Dimensions box are reversed, which is likely to cause me a real problem down the line

2

You can choose which axis is up when importing objects.

It’s in the transform tab in the right panel in the Blender View File window opened after doing File > Import > Wavefront (.obj). To unhide this panel click on the gear icon on the top right area of the header.

3

Hello birb
I confess I had missed that option but having tried it, it makes matters worse, so that is not the answer.
Thankyou.