Can't edit/ delete ancestry data

It started with just adding an extra ethnicity that was just "" so i edited it and rewrote the original ethnicity and made sure there were no spaces. When i save my changes it doesnt remove what i removed and only adds more. I dont know what's going on it keeps adding slashes and commas and square brackets. ex.my great grandmothers ethnicities are currently "["[\"German\"]", "[\"German\", \"[\\\"[\\\\\\\"german\\\\\\\"]\\\", \\\"[\\\\\\\"german\\\\\\\", \\\\\\\"\\\\\\\"]\\\"]\"]"]". I mean one of the slices of pie is literally "\\\"\\\"]\"]"]". pls help 


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