Question: why Maple gives duplicate solutions from solve sometimes?

Whenever I call solve, I now make sure to convert the solution to a set first to get rid of duplicate solutions which could be generated.

Is there a way to tell solve to return unique solution only by default?

sol:=solve(expr = 0,u):


But there are actually only 4. The other 4 are duplicated



This does not happen all the time,but I noticed it few times now. Is this to be expected?

Maple 2020.1


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