Strange sorting with v-for in combination with v-tab

[CrzKev]

Dear,

v-for around v-tab doesn't keep the same sorting. {1,2,3} With v-for alone you got 1, 2 ,3 Combination v-for v-tab you got 2, 3, 1

I have made an example the problem should be more clear. https://jsfiddle.net/b44cc4dq/2323/

Thank you in advance.

[CrzKev]

v-for has to be in the v-tab element why is not 100% clear to me. But for the people who has some interest.

https://jsfiddle.net/b44cc4dq/2353/