That's strange, because those two wallets, default_wallet.deterministic and default_wallet.imported were both ancient, from 2013 and long-discarded.  Modified today, though... maybe the wallet splitting process took the wrong default_wallet to split? 

Btw... I just found a few more wallets, modified today, in this folder, which seems weird:

C:\Users\btcbot\AppData\Local\VirtualStore\Program Files (x86)\Electrum

VirtualStore?