Trying to switch to IBR from SAVE

I’ve decided to accept the fact that nothing will be done with save and I need to make the switch to IBR, however I’m confused because I’m saying I’m switching IDR plans and it’s saying the end of term date is 2051. Which is in 25 years. But I know I have 222 payments out of 300 payments already. Why is it restarting my clock all over?