This feels a lot like the typical trick by free extension developers... add bugs so you'll pay for support or subscriptions. Anyway, it's easy to fix this. If, by the way, you want the buttons to look more 'crisp', go to /media/plg_joomgallery_joomphotoswipe and change icons-2x.png to This email address is being protected from spambots. You need JavaScript enabled to view it..
Anyway, just add the following style and the buttons should show up:
Then you'll notice there's a bug... when you touch the previous or next button then close it, you get redirected to the home page. So I just removed the previous and next buttons - also with a simple style:
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