I don't know if this is an issue with Itch or how a store page is setup, but I've noticed a few different games that report the same price as on Steam, but when I go to buy them on Itch, 20% tax is applied (I'm a UK customer, that's the VAT rate here). This does not happen on Steam, tax is already included, so the game costs more on Itch.
This was the case with Baba Is You (not checked recently), and is currently the case with A Short Hike. When I try to purchase the game on Itch, 20% tax is added for me, that's $7.99 + 20% = $9.59, which pushes the UK price to £7.61. On Steam the price is fixed to £5.79 (which includes tax). I would much rather support Itch and purchase the game here, but how can it compete if the price is higher?