Multiple Markers Same Position, Showing Different

[kirannegi]

My Array
that.stores = {
"FI": { "lat": "28.47087532", "longi": "77.04002468", "date": "Apr 19", "time": " 2018 22:05:01" },
"FLI": { "lat": "28.47087532", "longi": "77.04002468", "date": "Apr 19", "time": " 2018 22:05:01" },
"LI": { "lat": "28.47087532", "longi": "77.04002468", "date": "Apr 19", "time": " 2018 22:05:01" },
"BLI": { "lat": "28.47087532", "longi": "77.04002468", "date": "Apr 19", "time": " 2018 22:05:01" },
"BI": { "lat": "28.47087532", "longi": "77.04002468", "date": "Apr 19", "time": " 2018 22:05:56" },
"BRI": { "lat": "28.47087532", "longi": "77.04002468", "date": "Apr 19", "time": " 2018 22:06:05" },
"RI": { "lat": "28.47087532", "longi": "77.04002468", "date": "Apr 19", "time": " 2018 22:06:25" },
"FRI": { "lat": "28.47087532", "longi": "77.04002468", "date": "Apr 19", "time": " 2018 22:06:25" },
"SEL": { "lat": "28.47087532", "longi": "77.04002468", "date": "Apr 19", "time": " 2018 22:06:25" },
"ENGNO": { "lat": "28.47087532", "longi": "77.04002468", "date": "Apr 19", "time": " 2018 22:06:25" },
"PI": { "lat": "28.47087532", "longi": "77.04002468", "date": "Apr 19", "time": " 2018 22:06:25" },
"CHSNO": { "lat": "28.47087532", "longi": "77.04002468", "date": "Apr 19", "time": " 2018 22:06:25" },
"ODM": { "lat": "28.47087532", "longi": "77.04002468", "date": "Apr 19", "time": " 2018 22:06:25" },
"IN": { "lat": "28.47087532", "longi": "77.04002468", "date": "Apr 19", "time": " 2018 22:06:25" },
"rc": { "lat": "28.47087532", "longi": "77.04002468", "date": "Apr 19", "time": " 2018 22:06:25" }};

html

[kirannegi]

I have array of latitude and longitude with same coordination, if array length is less than 10, its showing perfect but when array length is grater than 15, marker showing wrong on map, showing other place but coordination is same.