Hello,
Hope you are having a nice day.
Please try to add this code in Theme Options > Styling > Custom css:
.wpcf7 input[type="text"], .wpcf7 input[type="number"], .wpcf7 input[type="email"], .wpcf7 input[type="search"], .wpcf7 input[type="password"], .wpcf7 input[type="tel"], .wpcf7 textarea, .wpcf7 label {
width: 100%;
}
Also, you need to update all required plugins http://xstore.helpscoutdocs.com/article/37-plugins-update
Regards