Online forms will not submit

My website just updated to WordPress 4.7.5 and I am using Contact Form 7 v.4.7. My problem is that since the WordPress update to (4.7.5) my online forms will not submit. I either get this message :”Failed to send your message. Please try later or contact the administrator by another method.” or the spinning arrows start and finish, but successful message does not pop up and the data is not saved in contact form database plugin.

You can access form at https://kids.brushyforkbaptist.com/galactic-starveyors-vbs/2017-vbs-preregistration-form/