Web service `GET` for Disaggregation Calc restricts user-input return periods less than 150 years

I can enter any return period between [1,20000] in the url, but if I try and enter anything less than 150 in the GET interface at https://earthquake.usgs.gov/nshmp/#/Hazard%20Disaggregation/disagg-calc-rp, then I get the following: