Like others have said the mounts probably have twisted. Especially with risers installed. It's just a stack of cylinders with some rubber in between. Nothing much to stop it from twisting. Loosen things up top a bit and with the front wheel between your legs twist it all back straight again. I have done it more that a few times. They twist really easily. About the only good thing with that is it's saves your bars a bit...maybe.
You should also loosen the upper and lower fork crowns a bit too and straighten them out the same way since they can also twist.
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