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This was reported to me by a player of my mod, but one of my buildings (a furnace prototype), was not selecting specific fluids on output fluidboxes. The recipes were still running and the fluids would leave the building when pipes are connected, but it does not seem to be filtering the outputs?
As shown here, the building is working properly and has the correct amount of fluid boxes to complete the recipe, but is seemingly not setting the output fluidboxes to the fluids being created.
I was able to persoanlly recreate this in my own save: I have included the save file with this presumed bug, all the mods are on the mod portal and so are freely accessible - however here is the code for the entity that this is happening on: (Just incase it does help though, the mod list being used is: Periodic Madness, Editor Extensions, Factory Planner and Factorio Library.)
Feel free to ask for anything else that might help :]

Thanks for the report. This is working as intended: furnaces do not lock their output fluids because they dynamically accept any inputs and will craft based off the first valid recipe they find. So with that in mind: they produce "what ever fluid the current recipe makes" and don't restrict the output pipes.

If you don't want that behavior, you'll want to use an assembling machine with a fixed recipe or manually set recipe.

that make sense, i wasnt entirely sure if it was a bug or not and wanted to check - thank you for the help though :]
I only just remebered you can manually set the fluid boxes inputs/outputs, so i'll attempt to help the issue through that avenue