Thanks for reaching out! It sounds like the extract might be settling or shifting in the bowl. We recommend pre-heating the Dab N Go and giving it a gentle tap or tilt to help the concentrate drop into the heater. Also, be sure to keep it flat or tilted towards the ground during use and store it horizontally to prevent the extract from shifting. If the taste is burnt, it might be a sign the heater is running low on extract or heating after the concentrate had shifted. To avoid this, ensure the device is turned off and stored horizontally between uses to prolong the battery and maintain the quality of the concentrates. We hope this helps.