This may be a silly question ??

We put down 4 brews yesterday

It was our last brew a Tooheys Special Larger kit with 850g dextrose,650g maltodextron,S-23 lager yeast not the kit
yeast & a tea bag of 12g Cluster hop pellets (usa),
The Hydrometer is calabrated @ 20 deg so after filling to 23lts & adding the hops we took a reading before add
the yeast & it was 1100 !!

I thought whats the go here the last 3 brews where about right & this one has blown out ??

or should we have done something different ?? ive never had a high reading like this,
I ran it through the brewraft Brewers calculator & it should of been Original SG - 1.051 & Final SG - 1017 = 5.1%,
I said to my mate bloody hell what have we got here rocket fuel !!


Cheers Rob.