Pr has never liked working with mp3 files, they're heavily compressed and seem to cause troubles at times.
Wav files however are normally great in Pr. Should not be an issue. Although I you can record audio while working in Pr, I wouldn't except for over-dubbing some short section.
That's what Audition is for in the Adobe apps. It's pretty good at capturing from a mic & recording to disc.
What did you use to capture the files? On a sequence in Pr, OBS, what? And how do they play outside Pr?