Amazon Prime — charges

Address:

16173 Carmine St, 92336

I have one charge on my bank card for 14.00 and one for 14.00 on my chase card i do not understand why i have two different charges. All so on the web site my account shows my payment should be for 12.00 a month please explain why and what these charges are for asap thank you i have my ordered by thing these charges have been coming out of my accounts for the past 3 months or so