FREE Collection Payment -- 1 dollar and 5 dollar [Topic edited for clarity]

Hi Cimmunity hope you are doing well

i have a little question about the icons nomination 

in july i got notifcation of the free collection some of my icons got nomminated in the nomination for 1$

i have places some of the images below these are the icons that got nominated for 1$

Now some days ago i again notifcation that i got assets eligible for nomination for 5$

here i mentioned them also 

i am confused both the categories are single icons 

but why the difference between the first ones nomination price and the price of the second ones 

as both are icons and single icons

please guide me community

thanks have a nice day