Good advice^^^
My next step would be to trash preferences.
If that fails, maybe delete the bus and recreate it(add a fresh AUX track and insert the plugins and see if that helps). You might also use a different bus for your routing. I have seen a bus get weird and changing to any other available bus cured the issue.
I know many people like to bus things, but to me, it over-complicates things and doesn't really bring an improvement in sound. My guitar tracks are always routed to the main outputs. I treat each guitar track with plugins for EQ, compression and such, but my delay and reverb plugins are always on their own AUX tracks and are fed by sends. I'm sure this is from my years of working on analog consoles as I like the simplicity
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BTW, your English is way better than my French!!
