“Unclaimed” is fine for now. To give wider context: allocations pass through a lifecycle that looks like this:
Open → Closed → Finalized → Claimed
Indexing rewards are received and distributed when an Indexer closes an allocation, taking it from Open to Closed. This is where the bulk of rewards (for Indexer & Delegators) comes from right now. 7 epochs after being Closed, the query dispute window closes, and allocations become Finalized. At this point, an Indexer can claim any Query Fee Rebates they have earned, which marks the allocation as Claimed. Given that query fees are so low right now, the marginal cost of claiming (in ETH gas fees) is not worth the marginal benefit (in GRT rebate claimed), so many indexers do not claim the rebate, which is rational behaviour.
In short, you shouldn’t be alarmed by this until query fees pick up substantially.
I would however poke your Indexer about allocating to more subgraphs than just PoolTogether!