The vacuum setting was too low.
Start the vacuum sealing process again with a new vacuum sealing bag and a higher vacuum setting.
There is still too much air in the vacuum sealing bag at the end of the vacuum sealing process.
Start the vacuum sealing process again with a new vacuum sealing bag and a higher vacuum setting.
Use a new smaller vacuum sealing bag or cut a larger bag to fit the size of the food.
Start the vacuum sealing process again, with a higher vacuum setting if necessary.