Hi,
Your plugin doesn’t compatible with bootstrap so created the problem.
Maximum pro theme using bootstrap so you should contact with plugin author for this issue.
The plugin author should compatible with bootstrap
Anyway please use the CSS code, I hope it’s work for you
/*Start css*/
.widget .collapsing {
height: inherit;
}
li.collapsing .sym{
padding-right: 18px !important;
}
.widget_categories li, .widget_archive li {
text-align: left;
}
Please add this css
span.collapsing.categories.collapse {
text-indent: 1px;
display: inline;
width: 19px;
}
/*End css*/
