Switch/outlet combo to regular outlet - strange wiring inside box

I had a dead switch and live outlet combo. Never figured out what the switch was for, so decided to cap it and replace with two-outlet. Opened up the box and found one black and one white wire to the outlet, and one single red wire to the switch. Switch and outlet were on different circuits. Ran a ground wire to the ground screw inside the box and reconnected the black and white to the new 2-outlet. Since I did this two days ago, two small appliances plugged in there have died, so I opened it up and re-tested the wires. Both the black and white wire are hot. Not understanding how this is possible. Used a receptacle analyzer, and all three lights light up, which isn't a status explained at all in the instructions. I'm kind of at a loss as to what to do from here. Any ideas?

 

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