atarist is hatari which is a non-retroarch emulator so its likely due to the emulator/ game as multiple key presses work fine for me in other retroarch based emulators.
You can try updating retropie-setup script and installing latest hatari from menu 5 in retropie-setup (new version since 3.1 image) – new emulator is built against SDL2 so it may work better (or not).
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