This sequence on the demo site reproduces the error:

Created new page /demo-project/test with template Section
Opened the page and created two teasers on the page (type Link list) with titles
Test teaser 1
Test teaser 2
Created a new version by activating the page (called A below)
Created a third teaser (Link list) with title
Test teaser 3
Moved "Test teaser 3" at the top of the page
Created a new version by activating the page (called B below)
Restored to version A

everything looks OK, the "Test teaser 3" is removed.
Restored to version B
ERROR: the "Test teaser 3" is restored but it's at the bottom of the page.