low quality during audio preview

hello to everyone. i'm new here and demand your help.
i noticed that the sound quality has declined considerably in the preview of songs. this is no problem in other friends' songs.

Hello to you, too. What is the bit depth and sample rate of your files?

Also, I've just read that Pond5 have had technical problems with uploads since last Wednesday, so perhaps it's related to that?

first, thank you for your interest and your response.

Bits Per Sample: 16
Sample Rate: 44100

last year they wrote this and the boss said improvements would be corrected by the end of the year. but i think the problem continues. or the problem may be about me :)

It is definitely a problem I can relate with. I have noticed it gets worse the more I eq or edit an instrument... I wonder why?

yeah, you're absolutely right. so i deleted the approved songs and thought that the problem originated from me :)