Somethin' went wrong on my divi builder...

My header and my footer run perfectly yesterday and I tested on multi-devices!!
But today :
1.My header is behind first section on my custom body and also miss placed(LOGO and MENU were on same height)... I don't know why, cause I've set z-index 999999 but still don't work..

2.My footer's height is still the same as I set yesterday but actual height is wrong...After I test on "Inspect elements'' on Chrome I've found there is a column that I don't know about..

but on my builder is like :


Is there anything I've done wrong??
Those two are normal yesterday on different devices but today just...IDK

 

BTW: https://www.distance.best/

 

and i found that my menu is unclickable

 

Is there any possible that because today's divi builder update?
this happened after I updated divi builder...

 

I really think it's a bug of divi builder 4.2...
I tried downloading divi header template and use it instead of mine, it shows the same error, elements are on wrong location on screen..
Is there any way to rollback to divi builder 4.1?

 

Sorry I don't have divi theme...
I use divi builder only

 

how can i go back to divi builder 4.1?

 

I've found out why:
1.header solution is:

set their position to 'static', it was 'relative' before, if it's set to 'fixed' or 'relative', my header will go behind my second section and be unclickable.

2.footer solution is:

After I disable 'min-height: 48px', all my elements' positions go back to right places.

but I didn't set those value on my own I don't know where it comes from I've check all my sections, rows, modules and their 'min-height' is set to auto..... I'm so confused.. Do you know why? Thank you in adavance!!!!

 

I am using 4.2.1, I'll just wait for 4.2.2 and see what will come...