Crystal confusion, dollars or sterling?

After the recent price increase for crystal packs for UK users (understandable due to decreased value of the pound after brexit etc) just went into the crystal section and it's showing the price as USD, but the same price as it was in UK sterling (after increase).

Showing as $19.99 (USD) for the chest that had been £19.99 (UK) - is this a typo on the currency and the chest will still be £19.99 or do I need to convert from USD to work out what cost is in sterling?

Confused over this and would appreciate any confirmation.

Edit: restarted the game and now showing as UK sterling again