Weird Color Change in some leaves

So I've been flowering for a few weeks now and I noticed 3 of my leaves have changed color from the dark green to an odd mix of red, yellow,and green. is this normal. never had this happen. Thanks
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coule be a couple of things, looks a bit like nutrition burn, try flushing its system with only water for 3-4 days.

Agreed, that looks like nute burn to me too

It look like a extreme amt of potassium splashed on the leaf. Possible u dripped nutrition water on it while feeding?

Treat that w/ a very mild and complete fertilizer. If its more severe I suggest u flush. Flush w/ a minimum of three times the volume of water for the volume of your growing medium.