A couple of symbols were missed out of the key.
/ = K2tog
\ = K2togtbl
On chart G at the end of Row 9 a \ is missing from the chart that will balance with chart F.
The sleeve cast on should be: 62 (62:62:68:68:70:70:76).
Row 1 (RS): P9 (11:13:15), pm, (P4, K1, P9, K3, P4) 3 times, pm, purl to end.
Row 2 (WS): Knit to mrk, slm, (K4, P3, K8, P1, K1 P1, K3) 3 times, slm, knit to end.
Row 3 after the diamond panel, the instructions should read P2, K6, P2.