FORMULA FED BABY CLUSTER FEEDING?

Amber
My 1 month old babygirl has been very fussy for the last week in the evenings (5-10pm) at first I thought she was just overtired because she's up longer throughout the day but finally realized on day 3 she's showing all hunger ques every 1-2 hours but normally eat 3oz every 3-4 hours during the day, I have started feeding her as a see her ques she normally takes 1-2 oz (fyi she rarely spits up and normally burps easily and is happy as can be all day) 
Any other formula feeding moms experiencing this? 
Is this considered cluster feeding?
Is this normal? 

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