Variants stopped receiving traffic

Hi there,
Noticed that some of the variants have recently received almost no traffic and conversions. Only the original variant keeps receiving traffic. Smart traffic mode is on. Why this may happen?
Screen Shot 2021-12-07 at 14.01.09

I’m guessing its because smart traffic is on, its prefering the one with a history of conversions. Disable the primary and leave the two new test variants.