Fix equals to updating PHPMyAdmin through Plesk. See screenshot. Thanks for the guy who showed me this. To bad I forgot your name... :[
See what I did here below? Frequently Copy-Pasting 5 sec in between.
"This forum requires that you wait 300 seconds between posts. Please try again in 160 seconds."
"This forum requires that you wait 300 seconds between posts. Please try again in 150 seconds."
"This forum requires that you wait 300 seconds between posts. Please try again in 145 seconds."
"This forum requires that you wait 300 seconds between posts. Please try again in 140 seconds."
"This forum requires that you wait 300 seconds between posts. Please try again in 135 seconds."
"This forum requires that you wait 300 seconds between posts. Please try again in 130 seconds."
"This forum requires that you wait 300 seconds between posts. Please try again in 125 seconds."
"This forum requires that you wait 300 seconds between posts. Please try again in 121 seconds."
...
"This forum requires that you wait 300 seconds between posts. Please try again in 82 seconds."
Do you get the idea? Don't you think this is ANNOYING? If you don't... then you are BROKEN.