Electric bill shock

Huge suprise today when opening electric bill,kinda concerned been running a 1000w 12/12 in one room and a 400w 18/6 in another started in late october and was feeling pretty good about first two months electric consumption. Upon a closer look turns out Dec and Jan were estimated bills based on previous consumption,Feb bill on the other hand was an actual reading and I realized a 700% increase, now I realize some of the consumption was from Nov and Dec, but is this some huge red flag, should i be concerned?
 
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