Most of the time when you are having an issue with a website it's caused by an out-of-date browser.
Update Chrome: https://support.google.com/chrome/answer/95414?hl=en
Update Internet Explorer: http://windows.microsoft.com/en-us/internet-explorer/download-ie
Update Firefox: https://support.mozilla.org/en-US/kb/update-firefox-latest-version
Update Safari: https://support.apple.com/en-us/HT204416
If the issue continues after the update please test it out in a different browser.