@CdS-Etermax
Clicks caused by the Buffer size not being large enough, are only audible through monitoring and they will most likely never get printed in the mix. People who asked you to increase the buffer size clearly haven’t read your post properly.
I have managed to pinpoint a major issue that seems very similar to yours.
Can you please take a look at it ? Phase drift and glitches with Transpose, Time stretching and AudioWarp/Quantize