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Why is my meat vacuum sealer not creating a strong, long-lasting seal, sometimes losing suction, and allowing air leaks—especially when meat juices or moisture get into the sealing area?
I have the same issues.
I find freezing the liquid first solves all liquid migration problems.
I freeze first in a snap top container then after removing the frozen item and placing in a bag, doing the vac seal.
First, welcome to the forum from New Mexico.
As Chasdev
said, pre freezing helps.
Also, wipe the inside of the bag after filling to remove any food/moisture that would disrupt the sealing.
If you don’t mind doubling your cost of vac sealing, I put the juicy stuff in a vac seal bag, fold down the top inch or two and place it in another vac bag for sealing. Air is out of both bags before the juices reach the sealing area.