What does (-;-) after a gene mean?
I suggest you to take the tutorial you can found from here
Before the $(-;-)$ there is the specific location of the gene in the DNA. Between the brackets you have your specific genotypes at the location marked before. So, whatever is inside the brackets is referred to a single nucleotide polymorphism (SNP) found in your gene. If there is nothing, as the case of the screenshot that you provided, is possible that they are not able to determine the SNP (so the SNP is not found and this information is missing).