Normally if a septic tank ( actually the lateral lines) where it drains, has water and sludge in it. Up to a level and after that level, it runs out into a drain field.
If there is a issue in the tank, or if the lines in the dreain field are blocked. The tank will fill up completely and often bubble into the ground, But you should see the ground wet around the septic tank.
I agree, this does sound more just like a blockage in a drain line.
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