gulp img not replacing files with case name changes

[LayneSmith]

If I add a .jpg to the images folder and call it _layneSmith.jpg, it goes through its process and everything is fine. If I go back and change the file name to all lower case, like _laynesmith.jpg, and then gulp, then deploy, it never picks up the file with the name changed. So new index.html calls for _laynesmith.jpg but server still has old _layneSmith.jpg.