What kind of hide? If it's a log hide, they often don't feel secure in those because two ends are open. If it's a circular hide with just one opening, it could be too big. Using sphagnum moss to fill up the space can work.

Sometimes they just like hiding places they aren't supposed to. Despite having a perfectly adequate system of hides that she typically uses, I'll someitmes walk in to find mine curled up hiding basically wearing her water dish as a hat.