When working short rows or partial knitting (manual wrap method). The knitting sequence to prevent holes:

• Opposite the carriage place needles in hold (carriage set to hold)
• Knit across the row
• Wrap the first needle in hold to prevent a hole
• Knit back to complete the short row shaping (2 rows knit)

An alternative to manual wrap is to Automatic Wrap.
Short Row Refresher