Latex is not a heat-sensitive product and does not react to body temperature. Your bedlinen could cause the overheating. Some people experience health issues when sleeping on synthetic materials like polyester. Using natural cotton bed sheets and duvets will create a pleasant microclimate in your bed. Also, if the bed is too soft and you sink too deeply in, the result could be a warmer sleep as the mattress topper surrounds your body and there is a lack of ventilation.
Tip: One way to find out if the mattress is too soft or too firm is to lie on your back and try to slide your hand under your lower back. If your hand goes in too easily, the mattress is probably too firm for you. If you struggle to slide it, this means the mattress is probably too soft. If you can slide your hand in with little resistance, this is the right firmness for you.