logo on web site disappear

HI a thanks for your support.

i have a problem with de logo of mi web page when I escroll dawn with de mouse or trackpad or using a phone it disappear and when I scroll up it appear but but when you entrance in the web it not appear, it showing only when you scroll up or dawn (it depend of you configuration of behavior of your mouse or trackpad or whatever).

So do you have some idea y didn’t no what to do so please help me im a beginner in this big world of web page design

the url of the problem its the next one www.davidparrafoto.com