Yes, that's normal. It takes time for them to get to know you and trust you. Remember, you're a giant scary creature to them!
I actually know from experience that tent time can really help them to get to know you and build trust. It's good if they run into their pouch when you go to see them at night, because then you can just take the whole pouch out with them inside and transport them into the tent. Have some treats ready to give to them. Sit in the tent and put the pouch in your lap, and wait! Talk to them, and given time one will probably be brave and curious and come out to meet you. Let him explore and run and jump, and see if you can give him a treat. His cagemate may work up the courage, too, after seeing the brave one is okay. Just let them explore and play! When they're tired or done, they'll either crawl back into the pouch or, in my experience more likely find a warm snuggly place on you to sleep! I'm always wearing a hoodie this time of year so my glider snuggles up either inside the hood or under the hood when he's done. Then I just carefully slip the hoodie off and carry it back to the cage to put him back inside. Just FYI the first time I did tent time with Fionn it took him about 30 minutes to work up the courage to come out
Also, I keep a blanket on the bottom of the tent and a few toys on the floor of the tent, too.
Let us know if you go for it! I think you'll have fun...it's great the first time your little fuzz butts climb all over you!