Resend doesn't work after cancelling A/B test

I created an A/B subject line test and set it to 50% / 50% 

When it ran it ran at 20%/20% so it only sent to 40% of my list. Total of 400. Not sure if I clicked something wrong or if this was a bug.

Anyway I decided I didn't want to wait two days for a result so I cancelled the second phase of the A/B test.

I decided to add more contacts, and tried to click 'Resend' option (to send to all except the original 400) but it wasn't there.

It seems maybe it got stuck thinking the A/B test wasn't complete. Not sure exactly but it was very annoying