NPC dialogue box opens at the end instead of the beginning

When opening a dialogue box with an NPC, instead of opening it from the beginning to the top, it opens it at the bottom. In other words, if you type a lot of text and open the dialogue box, it will take you to the end of the text instead of the beginning. This causes me a lot of problems when creating adventure maps, as players may not understand the text because it takes them to the end instead of the beginning.