Tron token transcation fee requires Energy and Bandwidth Points. Energy consumption depends on the smart contract of the token itself, if it is widely used, the required energy increases. On other hand, Bandwidth Points are given free daily for some amount and might increase if you stake TRXs. If your current Bandwidth Points daily are fully consumed, another TRX requires to be spent for the transaction, though it will be burned.
So, it seems you have already emptied out your current BP, thus it requires more TRX for transactions.
For further detailed explanation of how the TRX fee works, refer to below links:
https://developers.tron.network/docs/resource-model#bandwidthhttps://developers.tron.network/docs/resource-model#energy