I am new to D&D and don't know all the rules yet. But I have noticed when I get to level 4 on the Roll20 5e OGL charactermancer it's asking to roll 2 hit dice to gain hp. I thought you only gained one hit dice on level up and you roll that to determine how many hit points you gain. Also, it keeps saying that a rouges hit dice should be a d4 on the sheet. I have to change back to a d8 every time.