I have no idea what you did, but the reason they change, is because on some pages like the home page, there is extra CSS coming from
https://www.cosmostylingmarin.com/wp-content/plugins/wp-google-maps/css/font-awesome.min.css?ver=5.7
That changes the fonts style.
That extra rule that makes the icon smaller and oriented different is
.fa {
display: inline-block;
font: normal normal normal 14px/1 FontAwesome;
font-size: inherit;
text-rendering: auto;
-webkit-font-smoothing: antialiased;
-moz-osx-font-smoothing: grayscale;
}