Following scenario in the Filter view (Repeated and propagated matches):
You might note that the numbers have different positions. After correcting the position and confirming the segment, the grid looks like this:
A very simple example, indeed (plan B: filter segments, copy source to target and replace the word introduction or plan C: work with the assembled segment, as the only word is in the TB), but this behavior is a bit strange. All propagated segments change with confirming the one or the other segments. There are three tags in every segment (start, middle, end).
You mean this, Torsten?
So, in segment # 20 you got or typed '1-18 Einleitung', you pressed Enter and then got a modification of this and all other segments?
The above issue can arise if auto-propagation of numbers is activated in Edit > Preferences > Auto-propagation tab. The new auto-propagation option that blocks backward propagation will be added soon. For now, deactivating auto-propagation of numbers in such rare cases will do.