Sounds like a whole heap of confusing things going on here. you don't tell him off for pissing "properly" or for "squatting" but only when he cocks his leg ? Male dogs normally piss by cocking a leg unless they are bought up in a place with no trees or things to cock their leg against and will go into a small squat to pee.
Is he entire ? and what is his age. He may be marking if his hormones are kicking off.
As Mimms says, he is now probably associating pissing with being told off, so you will have to swap to praise for pissing until he knows if ok to do.
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