GAMEPLAY Multiple boots

i was playing ranked and played as Renekton ad bought longsword health potion and warding totem stayed in lane and i came back to buy tiamat then i went and bought boots and long sword. next buy i get pickaxe and 2 vision wards going back i went and bought hydra mercury treads farsight trinket and a 2nd BOOT!!!!!!!!!! eventually i was able to buy like 4 boots. they worked properly the unique passives didn't stack but i was able to use boots of mobility and mercury treads movement ability, i am not sure if this is intentional or not but i thought i should report it. my Sumner name is BurningBook11 and its on the north american server. i hope this is helpfull if u need any more info from me feel free to use my email which you should have in your servers