No, this is totally normal. A lot of people who keep T’s comment on their “pet hole”. By nature they’re not terribly active creatures anyway.
Which did you get? I find the Phlogius/Phlogiellus to be more on the surface (albeit standing around) and web heavier. The Selenotholus and Selenotypus species are more “lurk in the burrow” spiders (in my experience).
Edit to add: try checking at night when the lights have been off for a bit. They may be out then.
They’ll moult where they can. If they can in the burrow it’s because they feel safer down there (no predators to grab them as moulting can take quite some time).
Got any pics of your set ups? Welcome to the world of T’s
Here’s one of my pet holes (P. Hirsutus). This is about the most I’ve seen of it in awhile.