Nora GJH

Sorry that you have experienced this problem with the 2.0.3 release of the Affinity Suite. 
We have now released 2.0.4 on all platforms, and using those builds this problem no longer occurs.
Unfortunately while the Text Frame "Bottom" decoration UI was broken in 2.0.3. If you actually used that field to adjust your frame decoration, then when loaded into 2.0.4 your document will look different to the way it drew in the (incorrect) 2.0.3 version. Please tweak your decoration bottom value in 2.0.4 and it should look correct again (as it did in 1.10.x or 2.0.0)

Thanks for the screenshots.
As Carl said, this is a known issue in 2.0.3. When Serif fixes it in an upcoming update, your v1 file should display properly in that version but your 2.0.3 file will likely display incorrectly. The issue is the bottom field is reversed, positive to negative.

Text decoration problems have been reported several times in 2.0.3 and should be fixed in the next update
 

Just a comment. Opening it should not cause a problem. Saving it will cause that, though.