Yes, that is completely normal. Since the tire touches the roller in the same spot, over time a groove will start to develop. It is ok to continue using the trainer as long as the groove isn’t worn completely through the roller (i.e., you don’t see holes in the roller).
To reduce the amount of wear you see on the roller, please make sure your tire is inflated to the higher end of the manufacturers specs, and that you have the resistance unit tensioned against the wheel properly.
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