Kills

i think we all have this problem, but for me it's something sever, today, yesterday, and the day before yesterday, i got 3 Pentakills, but it didn't show it, and the kills were 2 SECONDS difference, it showed triple kill and then double kill. Today, same thing, i got a double kill, then after literally 3 SECONDS(Not even minutes) i got another kill and it didn't say ''Triple Kill'' as it was supposed to say, then i went for the 2 kills on top, iti didn't even say double kill i think, and the kills were same thing, 2 SECONDS difference, this is a problem because on youtube, when i search for league moments, i see people that wait 3 MINUTES(Not seconds) with a quadra, then get the other kill and get penta, what is this? It can't even say for ME that i get penta when the kills were 2 seconds difference, but it can say for others that got the kills at a 3 MINUTE difference? This is a real bug i saw everytime i got a triple and it didn't show ''Triple Kill'', i don't actually know if you can do anything about that but i just had to report this because it's kinda bothering me.