There must be a glitch somehow on your computer. Try to do a clear cache and cookies.
It is working just fine for me. Make sure you enter your self-employment income first before you enter your SEP IRA contributions.
Here is a help article on Where do I enter my SEP IRA contributions?
Here is a link to How to clear your cache.
Here is what I have on my screen after clicking on the Jump to sep ira contributions: