dys 388=13

what does it mean to have dys388= 13? I have read the it occurring for R1b's are rare but documented. I have found out that middle eastern haplogroups like G2 and J1 have the same value, so does this mean as R1b were migrating to Europe that some how my haplogroup kept this mutation maybe persevering it as a tie to the old world. If this is true then my haplogroup could be quite old, yes?

Any feedback or information is welcomed!