As with most pods, if you remove the coil while the pod has e-liquid in it, the pod will spill out the e-liquid.
What I find that works is to turn the pod upside down, drip tip facing downwards, place your finger tightly over the drip tip opening then remove the coil.
Keep your finger tightly over the opening in the drip tip while you replace the coil.
Once done, turn the pod the right way up and remove your finger. You should fine the e-liquid is still on the pod with very little spillage.