texstudio not synchro 'Go to source' in one of the chapter (or child document)

I’m having a problem with SyncTeX. ‘Go to source’ (i.e. from PDF to TeX and vice versa) only in one of my chapter, but in others it is spot on. Any idea what might be going on?

NB I am compiling with synctex=1 and I’ve tried deleting *.synctex and *.synctex.gz in the working directory. as well as texstudio.ini as suggested by others (TeXstudio 2.11.2).