Seaborn Scatterplot is using multiple different markers instead of dots

I am running seaborn 0.13.2.I am trying to make a scatterplot with only dots. When i try sns.scatterplot(end_of_year_2018) it shows all kind of weird symbols, from triangles to +,* etc. etc. (see picture below)

So I tried to make a scatterplot like this:

end_of_year_2018 = yf.download ([     "ABBN.SW", "ADEN.SW", "CFR.SW", "SGSN.SW",     "HOLN.SW", "NESN.SW", "NOVN.SW",      "ROG.SW", "SREN.SW", "SCMN.SW",      "UHR.SW", "UBSG.SW", "ZURN.SW" ], start = '2018-12-28', end = '2018-12-29')['Adj Close']sns.scatterplot(end_of_year_2018, marker='o')

but still all of these symbols are present.

Everything else works just fine.

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I already tried updating me Seaborn: pip install --upgrade seabornI tried resetting seaborn: sns.set(rc=None)

The rest of the plot works just fine, what should I do?