I think this is a fairly common problem here, it put my RDI way too high as well and I had to manually change it. To change it, from any page here just click on the "Food" button under "My Diet Calendar", on the food page go to the bottom and click on the RDI box, this takes you to recalculate your RDI. Input all the same stuff you did, click on calculate, and then manually change the value you want in the box there, then click Save.
Welcome and good luck!