The attributes of the region tag are saved using the system format.
f.e.
system decimal separator: "."
<region region-id="2" left="3.25" top="25.75" width="58.75" height="20" align-x="0" align-y="37.75" show-border="false" show-highlight="false" is-protected="true" z-order="0" background-color="inherit" tag="">
system decimal separator: ","
<region region-id="2" left="3,25" top="25,75" width="58,75" height="20" align-x="0" align-y="37,75" show-border="false" show-highlight="false" is-protected="true" z-order="0" background-color="inherit" tag="">
99% possible cause of this bug (can't test it directly)