There is a minute gap between 2 gridster Item even though margin set as zero and the gap is not consistent in all the items. How to resolve this gap issue

[pgJinesh]

please find the attachment for the screen shot:

Glister option we provided as = {
gridType: GridType.ScrollVertical,
compactType: 'compactUp&Left',
displayGrid: 'onDrag&Resize',
margin:0,
pushItems: true,
draggable: {
enabled: true
},
resizable: {
enabled: true
},
minCols:60,
minRows:60,
maxCols:120,
maxItemCols :120,
maxRows: 5000,
mobileBreakpoint: 640,
swap: true,
outerMargin: true
};