While there is no content for https://store.kde.org/browse?cat=411, the current category name does not match the custom casing of the game (which has been always "KsirK", not "KSirk").
Recently someone fixed the category idenfier in the knsrc file without seemingly knowing the effect is. Well, no content as before shown in the GHNS dialog ;) But still broken. See https://invent.kde.org/games/ksirk/-/blame/release/22.04/ksirk/ksirk.knsrc#L3 for the current released version.
Given there is no content currently anyway, I propose to just ignore being backward-compatible and adapt the category id also on the store. So that at least from now on the category name follows the game name in casing.