Plugin modified footer

I recently added your plugin to a site. I then noticed that there was a problem with a slider that was on the site, as it had stopped working. One image was visible but there was slider effect.Upon further investigation it was determined that the footer for the child theme was missing 2 closing elements. The footer file showed that it had been modified the same day that I installed your plugin.Is it possible that the plugin modified the footer file? In addition, when WP is set to WP Debug the following code shows up.
‘Notice: Undefined index: state in patchesthunderbeach.ca/wp-content/plugins/my-weather/my_weather.php on line 280

Notice: Undefined index: state_name in patchesthunderbeach.ca/wp-content/plugins/my-weather/my_weather.php on line 282′
Thought you might be interested in this.
Thanks

https://wordpress.org/plugins/my-weather/