I believe the 100% is not APR, but the commission that the validator takes out of your stake... in your case, THEY are taking all of your staked earnings (which is around 15%).
No problem though. You can "redelegate" to a different validator that only takes 10% or 2%. I suggest Carbon Zero as they are active on Hive and bring lots of news about the COSMOS ecosystem. 
I got into the Cosmos a while back and although the markets have not been good to it with LUNA being an IBC chain... and with the markets melting down anyway... I am pretty confident that there is crazy growth happening here over the next year or two and $6 ATOM and $0.22 ComDex is going to be looked at in a few years jaw droppingly.
I hope this helps.
RE: 100% commission for delegating to a Cosmos Validator