Just leave them be for awhile. It sounds like stress might be affecting them, and this is not unusual. Whenever a sundew makes a change from one home to another, a period of adjustment will be needed.
Generally, Drosera (other than the petiolaris species) really prefer cooler conditions generally, but a happy plant won't complain at 80F. 55-65F is paradise to them.
Here are some other considerations toward losing your newbie status, lol.
Use pure water such as rain or distilled. Some species are highly sensitive to mineral buildup in the substrate. If they sit in water trays, either let the trays dry out before refilling, or change the water every 2 weeks.
Provide ample light of good spectrum (I use 1 cool white to one balanced spectrum 40 watts in a 4 foot shoplight fixture). Drosera are real light hungry plants. Provide some sun when possible, but go very slowly with exposure, especially in a terrarium where heat and sunburn can damage the plants. It sounds like you are keeping the plants close to the light, and this is good. You might want to consider raising the lights though if they are sitting on top of your terrarium. The bulbs generate unwanted heat, but the plants should still stay within 4 inches of the tubes. The difference of an inch or two is very significant in terms of how much light is reaching your plants through the glass.
Most species will do well in a relative humidity 0f 40% and higher. !00% humidity is not always optimal. It may help your plant to recover from its stress, but a healthy and strongly growing plant can adjust to the lower humidity with no complaints. This is called growing your plants "hard" vs "soft" as in terrarium culture. A hard grown plant is healthier and more disease resistant, and more like how they grow in habitat.
Provide air circulation. Keep the terrarium cracked a little. The plants enjoy fresh air, cool nights, bright days.
Whenever possible grow the plants from seed. Seed grown plants are always better adjusted to your own conditions.
Feed your plants only when healthy and dewy. I recommend dried bloodworms ground into powder and sprinkeled on the leaves, or allow them to feed naturally in outdoor culture.
Good luck with your plants! Drosera are wonderful plants!