Most of the factors are much too short to be the result of broken/badly initialised PRNGs. The exceptions claim to belong to alice@example.com and txn@ti.com, a

Most of the factors are much too short to be the result of broken/badly initialised PRNGs. The exceptions claim to belong to alice@example.com and txn@ti.com, and the TI ones aren't actually PGP keys at all - one is the 512-bit firmware signing key for the TI-83+ calculator which was factored the hard way a while back and another is a key someone's created sharing the same prime, most likely as a way of mocking TI. Other than those two pairs of obviously-fake keys, the rest are most likely just the result of keys being corrupted somewhere in the process of being uploaded to the keyserver.