Issue with chord placement in MS 4.4.4

A little special: As a piano player, I may have a voice system above my own part, but I put the chords above the piano, so inbetween the lines. It ended up like this:

Seems to be more or less reproductible. Looks like this happens:
a) All chords are in the right place except for a few systems where all chords are too close to the song text and with a slightly too high distance towards the piano part;
b) The value "Versatz" (not sure what it is in English) is at -1.5, when reducing it to -1.4, it may happen that it jumps down to almost the right place (so in fact, it wasn't at -1.5). If I put it back to -1.5, it's totally in the right place. I can do the same to all chord symbols in the system and everything looks nice;
c) if I find a second system with the same problem, I restart doing what I did, but the program/the chart behaves differently; this may also happen at the first attempt: Every time I reduce or augment the "Versatz" value, the distance between piano and voice gets wider. There is no way to get them back together. It ends up in a total mess. If I save that messed-up chart and re-open it, everything is back to what it was: no messed-up system, but the chords still in the wrong place - too far from the piano part.
Interestingly, not only the marked chord jumps to the new place, but another one from the same bar as well:

Side note: The not correctly placed line with chord symbols initially had a chord that overlapped with an adjacent one, so it was placed above the others. When the problem occurs, it's for some reason in line with the others.