My acc have a problem i can't see blocks(the blocks are not barriers to be invs)

hey miniblox i recently got loged off my acc and when i log in again everytime i join a server no matter what i can't see blocks its like they all became barriers but they werent because when i click F3 i target a block its say its name not barrier but the only thing i can see when i join a server is a bed-chest-signs that all that i can see idk if there are more things i can see exept them but can u tell me how to fix this error ? thank you!oh and also my PC is for school so i enter miniblox from other websites let me know if it's because of this! CYA