Dude import role base price

We see that the woocommerce site imports the prices of 2 options:

Option 1:
a: 2: {s: 8: “customer”; a: 2: {s: 13: “regular_price”; s: 5: “839700”; s: 13: “selling_price”; s: 0: “”;} s: 12: “distributor”; a: 2: {s: 13: “regular_price”; s: 5: “631300”; s: 13: “selling_price”; s: 0: “”;}}

Option 2:
a: 2: {s: 8: “customer”; a: 2: {s: 13: “regular_price”; s: 6: “839700”; s: 13: “selling_price”; s: 0: “”;} s: 12: “distributor”; a: 2: {s: 13: “regular_price”; s: 6: “631300”; s: 13: “selling_price”; s: 0: “”;}}

Why are some s: 5 and others s: 6?

Thank you!