I need to fix the popup top and left

You can do this by editing script/jquery.imagemapster.min.js file. In function on line number 1419.
function i(e, t) {
var r = {
left: t.left + “px”,
top: t.top + “px”
},
i = e.attr(“data-opacity”) || 0,
s = e.css(“z-index”);
if (parseInt(s, 10) === 0 || s === “auto”) r[“z-index”] = 9999;
e.css(r).addClass(“mapster_tooltip”), t.fadeDuration && t.fadeDuration > 0 ? n.fader(e[0], 0, i, t.fadeDuration) : n.setOpacity(e[0], i)
}

Replace this by

function i(e, t) {
var r = {
left: “100px”,
top: “100px”
},
i = e.attr(“data-opacity”) || 0,
s = e.css(“z-index”);
if (parseInt(s, 10) === 0 || s === “auto”) r[“z-index”] = 9999;
e.css(r).addClass(“mapster_tooltip”), t.fadeDuration && t.fadeDuration > 0 ? n.fader(e[0], 0, i, t.fadeDuration) : n.setOpacity(e[0], i)
}

You can change left and top according to your need.