Hi :)

the "leisure=swimming_pool" is for the water feature only. You tagged the whole area where people can lounge and walk as pool, which it clearly is not.

Please check the wiki frequently for information on the things you wish to map. There's a little "i" next to most tags which will lead you to an explanation and to the relevant wiki page.
I also linked several pages already in earlier comments. 

happy mapping
silversurfer83
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