The EQ bug you're describing, Genixia, only happens when you hand-modify the Q parameter for a single band in L/R locked mode.

And Shadow45, make sure you narrow down whether it's the head/wiring or the amp by swapping left for right (RCAs at the amp) and seeing if the static moves to the other side. If the static does not move to the other side, then it's the amp needing to be replaced.
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Tony Fabris