It just moves around a lot on low liquidity.
Interestingly, this just happened....
Western Uranium & Vanadium Announces Mining Restart at the Sunday Mine Complex
https://www.globenewswire.com/news-release/2021/07/06/2258350/0/en/Western-Uranium-Vanadium-Announces-Mining-Restart-at-the-Sunday-Mine-Complex.html