[BUG] Incorrect range signalling

[Selur]

• "Source info" shows the data collected during the analysis of the source. Can't tell exactly where the info comes from in your case without a debug output of the analysis.
  
• "Overwrite output" forces that a specific luma range value is signaled to the encoder configuration from the filtering.
  When I load a source that is signaled as 'tv'/'limited' range and check for example 'x264->VUI->Video Usability Information->Luma Range' it shows 'limited'. When changing "Filtering->Misc->Overwrite Output->Output Luminance" to 'pc' 'x264->VUI->Video Usability Information->Luma Range' changes to 'full'.
  => works here as intended.
  According to your screenshot:
  
  Input is detected as 'tv' but output is signaled as 'pc',....
  

Overwrite Output -> Output Luminance resets every time, despite box being checked

If you close Hybrid, by default, no settings get saved. If you want Hybrid to remember stuff you need to configure it to do so.
read: [INFO] About profiles and saving settings,....

=> I can't see a problem or bug, looking at the information you provided.

Side note: Overwriting the output luminance will only change the signaling flags, it will not do a conversion.
For a color matrix conversion 'Vapoursynth->Color->Matrix->ColorMatrix' is normally used.

Cu Selur