I’m confused

How does the TS Sub 18 clip limit LED work?

I have 2 ts115a's running from my ts sub 18 and the sub is constantly lighting up green with the "signal limit". If i turn my ts115a's to 3 quarters and 100% master they are fine but when i raise my sub18 past 15% it starts lighting up green with the signal limit. Am i doing something wrong, is the sub not very powerful or is the signal limit not something to worry about? I appreciate any help thank you.
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