Even if it looks well sealed, it still could be humidity and popping sound usually means wet filament. That being said, you didn’t mentioned if it was pla/petg… Guessing it is pla due to the temp you are using but always best to mention it. Have you watched the print ? Did it actually change temp while printing? because between 190 and 220, there is usually more difference than what you have here, especially on the bridge part.