Tempo detecting reference track + applying - MIDI not following new grid?

Hi all

I have a fat rock song that been notated at 83bpm and to get more “feel” I have imported a reference drum track that I then have tempo detected in the project in order to apply to my midi and audio.
Oddly, the audio is following but no matter what I do the midi is “off the grid” and not adhering to the newly edited tempo track.
If I manually imput tempo changes WITHOUT tempo detecting the refernce track in the same project (IE opening a new project and detecting tempo there and copy pasting the tempo changes) then it works perfectly.
I suspect tempo detecting is doing something under the hood that is wrecking my midi sync.
Any tips?

Thanks

Hi,

Make sure, the MIDI track is set to the Musical time base, please.