been a few threads on this, there is an FAQ on the issue you can sign up for updates
https://ttlc.intuit.com/turbotax-support/en-us/help-article/form-1099-r/nondeductible-contributions-...
but in recent threads (see below) some people have reported being able to move through it by clicking many times, or double-clicking so you can try that as a workaround or use forms mode to make the updates for this topic.
https://ttlc.intuit.com/community/taxes/discussion/step-by-step-stuck-on-nondeductible-ira-question/...
https://ttlc.intuit.com/community/taxes/discussion/re-data-entry-for-nondeductible-iras-is-not-worki...
