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Circles appear when you tap a Windows card game: check the touch indicator
If a circle appears under your finger whenever you tap a touchscreen game, compare the same gesture on a harmless Windows screen. Record whether the circle follows taps elsewhere and whether the game still responds normally.
What to check
Microsoft documents an accessibility Touch indicator that shows a circle where you touch. Its options can make the circle darker and larger. Read the current option under Accessibility > Mouse pointer & touch. The indicator can be an intentional aid.
Compare one example
For example, the same circle appears when you tap a card and when you tap a Windows Settings tab. Record that as a system-wide observation. If the mark appears only inside one game, check its own touch or animation options and note the screen where you see it.