Giveaway submission problem

When trying to do the submissions for the 5x Giveaway, I fulfilled all the tasks but just can't do the "Retweet a Tweet" part. I have tried it with both the browsers, Microsoft Edge and Google Chrome but in the both of the cases the "Retweet this tweet" button doesn't work and all I see is the text 'Loading Preview...'
Can you kindly help me with this?