Cache break

Hey There!

I am not very deep into this cache topic but if I go to my own site and look at it with the Google DevTools I always saw a new timestamp many times at the end of the source code

<!– Dynamic page generated in 3.105 seconds. –>
<!– Cached page generated by WP-Super-Cache on 2019-05-14 08:11:49 –>

Does this mean that the cache is broken?

thnx for helping

The page I need help with: [log in to see the link]