Did you by chance disconnect any of the air lines when you did this change?
If you didn't, then you probably need to replace the height sensor because what causes the extended mode is if during the raising of the corner, the computer can't detect any height change, then it goes into extended mode because it thinks the car is hung up.
If you did disconnect any air line, then you likely swapped the left and right side so when it is raising one corner, it is actually raising the wrong corner and thus the extended mode.
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