One rough note in an otherwise useful sketch

The same saved music export sounds noticeably rougher on one pair of headphones. On the desk speakers I barely notice the passage, although the room is not particularly quiet. I am hesitant to process the track immediately. The file is identical in both cases; I have not made a second encode or downloaded another version. A search brought me to ai audio artifact removal but I would like to rule out the playback chain before treating this as a repair problem. I plan to check whether an equalizer is active. After that I can compare at similar listening levels. Would borrowing another pair of headphones tell me more than inspecting a picture of the sound? A second playback app is available too. The aim is to locate the cause first. What would you investigate after those checks?