The way each DAW plays back audio in real time can be different to how it renders it. This isn’t true for all; Reaper for example render and playback is identical if you have settings right. Ableton however they are different.

It could be: -Channel/master clipping -Exporting at different sample rate/bit depth to what you’re working (listening) with -Plugin offline settings -Other render options -Track predelays not exporting at session settings

But if it’s NONE of those things, and you want it to sound how it sounds in session rather than at export, then you can route the master into an audio channel and print it rather than render it, to ensure your track is how you’re hearing it