I think successful submission means AC’ed solutions among all submitted solution so It doesn’t mean that this problem is solved by the number of persons equal to the successful solutions.
This is wrong way , there must be one another column to present the number of programmer solved this problem.
SEASHUF is solved by only 47 people till now, but its showing > 590 successful solutions.
When today morning I saw the contest page I thought OMG What happened with SEASHUF problem that these many people submitted it correctly.
Codechef must look into this.