4 months, 8 months, 12 months, and 12+a months staking give more votes corresponding to 1x, 2x, 4x, and 8x coefficients respectively. If the selected period of additional staking is shorter than the previously selected staking period, each case will be applied to a different rate.
Example 1) If you stake 100 KSP for 4 months first and stake an additional 100 KSP for 12 months sequentially, a total of 800 vKSP is obtained by applying 4 times the 200 KSP.
Example 2) If you stake 100 KSP for 12 months first and stake an additional 100 KSP for 4 months sequentially, a total of 500 vKSP is obtained by applying different multiple rates. (the first 12 months staking will get 400 vKSP while another 4 months staking will get 100 vKSP each.)