I just can't remember... This has never happened before Whats wrong with me?

Ok well this kid just got transferred to our school from haiti and my friend introduced me to him and it wasn't anything unusual just kinda hello, what's up and stuff like that well i saw what he looked like then but as soon as he walked away he left my mind and i 4got what he looked like... So then my friend says hi to him in the hallway and he says hi back but i never know if its him cuz again as soon as he walks away i 4get what he looks like??? Then he walked up to me in the library and was like hello and i didn't know who it was but it was him but i didn't know cuz it was like i was seeing him for the first time or sumthin cuz then as soon as he walks away i 4get UHHH its so annoying whats wrong with me im usually really good a remembering what people look like this has never happpened its like i can look back and remember our short little convos but i can never place his face??? its just like not there????? i can never tell its so weird and its only with this kid its lke im blinded by him for a second or sumthing idk whats wrong with me im 14 and in 9th grade??? help!! I mean what is this??