Game rigged or just super bugged???

So usually I don't have a problem doing a special after a 4 hit combo (MLLL + special) and most of the time I can also do a 5 hit combo (MLLLM + special), but it seems that on hard content the AI will ALWAYS block it!
I'm doing a run now at 5-2-5 and it seems the AI is able to block my specials EVERY TIME!!! Both after a 5 hit combo AND 4 hit combo! I tried it with different champs on different enemies!
Any reason it happens on hard content only and not anywhere else??? Or...
I'm doing a run now at 5-2-5 and it seems the AI is able to block my specials EVERY TIME!!! Both after a 5 hit combo AND 4 hit combo! I tried it with different champs on different enemies!
Any reason it happens on hard content only and not anywhere else??? Or...
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