There are two reasons: you didn't salt and drain your tomatoes and the bruschetta topping has been on the bread for two long. Tomatoes naturally contain a lot of water, so it's best to peel them, dice them, and place them into the colander to drain. Adding salt helps draw out the extra liquids out of the tomatoes. Make sure not to skip this step! After you've made your crispy bread and the topping, make sure to wait until you're ready to serve this appetizer before you combine them! Bruschetta topping will always contain some juices so adding the topping onto the crispy bread too soon will make the bread soft and soggy.