It simply means that it has been kicking some hairs.
don't worry man
It seems weird because it also cloesd off it burrow completly
Yes, they often does that when they´re getting ready to moult or otherwise don´t want to be disturbed
No, not weird at all. That basically is a 'Do not disturb' label
Ah, ok. The problem is that these Exo Terras are meant for arboreal tarantulas (front opening). What you have is a terrestrial species and they can hurt themselves if they fall from the top of the enclosure. Since it has barricaded itself now, let it be until at least a week after it moults, but then you should rehouse it into a more suitable enclosure. Also, do you have a heat mat underneath the enclosure? If so, that is very bad for your tarantula.
No heat mat
Good
As a rule of the thumb a terrestrial should have no more than one-and-half to two times the legspan in climbing height from the substrate to the top of the enclosure.
Believe me, they can climb glass with no problems.
It means he's going to be buying an itty-bitty sports car, chasing after much younger lady tarantulas, and generally making bad decisions.
As they get closer to molting, even arboreal tarantulas can get a little clumsy and have trouble climbing glass. Once it comes out of that burrow with a fresh new pelt, it's going to be hanging from the rafters and swinging from the chandelier (so to speak) in no time, even if it is a terrestrial species. Especially if it doesn't like the substrate - such as if the substrate is too wet. Species from arid regions tend to play "The Floor is Lava" whenever their substrate gets a little damp.