Not clear to me how a second sound file import could distort a previous import to a different utility track.

But BiaB can stretch imported audio if the audio master tempo is off, so try this...

Go to Tracks view and select (ie click on) one of the impacted tracks. Go to the Audio drop down menu and select Set Audio Master (Base) Tempo. When the dialogue box pops up, check to see if the tempo in the box is the same as your song's. If not, change it to 0.

Repeat the step above for your 2nd track.

If you do this in Track view with the audio waveforms visible, you can watch individual tracks stretch as you change the Audio Master Tempo.

This should only take a minute to check. Sorry I can't be more help.

Good luck!

DC Ron
BiaB Audiophile
Presonus Studio One
StudioCat DAW dual screen
Presonus Faderport 16
Too many guitars (is that a thing?)