Problem

In certain cases spaces get removed on saving. Could be connected termtagging (see segment 59 in linked TS-task). But perhaps not (see segment 27 in linked TS task).

Might be connected to server side message about "Aus diesem Segment wurden nicht darstellbare Zeichen entfernt (mehrere Leerzeichen, Tabulatoren, Zeilenumbrüche, etc.)!"

User says it occurs together with this (maybe not always?)

Happend also, when going through all segments that contain a certain phrase and replace it with CTRL+V like explained in this comment:

https://jira.translate5.net/browse/TS-4942?focusedCommentId=57821&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-57821

Solution 

Fix it