Key signature change to C major adds extra space after the clef in error
OS: Windows 10 (10.0), Arch.: x86_64, MuseScore version (64-bit): 18.104.22.1681459983, revision: 465e7b6
Open the attached score. Look at the start of system 3 (M9). Here the key sig. changes to C major. Extra space has been added, in error, between the clef and the time sig.
Contrast this with the start of the piece which is also in C major. Here the space between the clef and time sig. is as expected.