hi welcome to bimmerwerkz..
1 foot high is pretty bad, right in the middle i take it? you may have to get it checked by a mechanic, because those damn wipers are one of my e36 nemesis, if i were to guess i would think the motor has have somehow reset to think that where they are currently at is where they currently should be but like i said i hate wipers.
hopefully someone else can chime in here and give you a better answer,
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