Bombarded with “Pending Sales”

Wondering if anyone else has had this experience. For the past week i’ve been getting bombarded with “Pending” Orders which never pass payment verifications. I still get some that pass but i constantly have 40-90 “Pending” orders. To me this seems like it is malicious attempt as it removes my inventory for the duration of the pending sale.

Any insight is appreciated as regularly i would only have 3-10 pending orders consistently with those regularly passing payment verification.