There are a couple of spots that randomly lose speed/send your kart into the air which I think it’s not supposed to happen.
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The second ramp, where you pass the first checkpoint. Random speed loss.
riptide_bug1 -
The bridge after the first checkpoint. Your kart sometimes lifts off on the top of the bridge.
riptide_bug2_1
It should be staying on the surface like this.
riptide_bug2_2 -
The last bridge, where places near the end of a lap. Random speed loss.
riptide_bug3