The Hiface does indeed pass true 24/192.
I'm thinking power amp had a hiccup during the conversion.
something may have corrupted the file during the process... some service or anti virus app might have fouled things up while the process was ongoing.
Something went wrong IF the downloaded 'true' or 'native' file played well.
it's true too that little if anything is gained by upsampling & converting to higher res files from lower ones. it's about content not just numbers.
Once done up, you've simply got a larger file containing the same info.
TIP... when converting up... just use doubles of the sampling rate. 44 > 88; 48 > 96; 88 ? 176; 96 > 192.
IF the orig track is recorded at higher rates initially, that's a high res file and will contain more info
It's almost like taking a MP3 and turning it into a WAV file... so what? Same stuff, just bigger.
conversions aren't bad things but mostly it's for players whose format or file types is limited... like they don't play FLAC or AIF... not just the word or freqs.
Good luck.