Close the airflow fully before you refill the tank. Keeping airflow open during filling lets liquid run straight into the coil and chimney, which causes flooding and spitback.
Avoid overfilling. Stop filling before the liquid reaches the central chimney tube. Overfilling forces e-liquid into areas that should stay clear of liquid.
Check the coil is properly primed and seated. Before you first use a new coil, add a few drops of e-liquid directly onto the coil's cotton ports and leave it to soak for several minutes. A coil that has not been primed can flood unevenly and gurgle from the first draw.
If the tank is already gurgling, remove the drip tip and gently flick the tank downward over a tissue to clear pooled liquid from the chimney. Do not blow back through the drip tip, as this pushes liquid further into the coil.
If the problem continues after following all steps above, the coil may be damaged or at the end of its life. Replace it with a compatible coil and re-prime before use.
If none of the above resolves the issue, contact Geekvape support or the retailer for further assistance.

Aegis Mini 5 75W: Tank is gurgling or spitting e-liquid into my mouth

Why this happens