Why does my Artz theme sticky header jump when scrolling?

Hello, im using Artz theme and i already have sticky header.

The problem with my sticky header is when you scroll down from the top of the page and the sticky header starts to work it jumps.

It’s hard to explain it in text, in order to see that you will have to go to my website : swelit.com

and check it out, when you scroll down a little bit you will see the jump that I’m talking about.

Thanks in advance for helpers, and sorry i couldn’t explain myself better.

@Swelit

Add following code in your frame.scss.liquid file:

.sticky-wrapper{margin-top:54px;}
.site-header .shopify-section, .site-header .desktop-megamenu{float:left; width:100%;}

and remove the following code from that file:

.sticky-wrapper  { height:auto !important;}
.is-sticky { height:auto !important;}

Cheers,

Tejas

hi there! im having the same issue but i cant seem to find any file named

frame.scss.liquid