stuck on a pattern for a market bag

I need help....im working on the "body" of the bag. I have 88 sc after my first rnd. And that is what im supposed to have. Rnd 2 is ch1, sc in each st around; join with sl st in first sc. repeat this round until my bag is 6 inches high. But im not sure if I should be sl st into the chain or the sc. Ive tried both ways and I dont end up with 88. I keep getting 91, 90. I have also torn the bag apart because the corner where I am joining the row is 1/2 taller than all other corners....help please

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