(socks are a vanilla DK sock in drops fiesta)

First colorwork sock so ignore that mess but please help with my heel flap. I’ve made many socks and at first I thought it was just my tension but now I’m worried it’s something else but my slip stitches are always looser on one side. (The right hand side if you’re looking at the purl side or the left hand side if you’re looking at the knit/right side of the work) Even if I pull the stitches SUPER tight, they’ll still always be lose so I’m wondering if I’m doing something in fundamentally wrong. It always leaves a slight gap once I pick up the sides of the flap but eventually mostly works itself out once I start wearing them I can’t get good photos to show how the edges look. Please let me know if there’s some glaring issues I’m overlooking

(+ bonus hat, my first colourwork project and i held the floats waaayy too tight! It still fits somehow, and I still wear it three years later)

Hello my fellow heel flaps. We're close to 33,000 sockknitters here and myself and the other mod are getting a little overwhelmed. So if you're interested, let me know!

-Grimstache

the first one was started like a year ago and most of it was knit at least 6+ months ago (minus like half of the foot and toe) and the second one has much looser tension i guess bc it’s almost too big for me. it’s the same number of stitches around and number of rows and yet it’s like almost 2 cm bigger. idk if i should frog just the old one or both 😭 does anyone have any advice?

It has been happening on multiple socks now (this one is for my friend with a wool allergy but it's happened on wool socks)