cables are made by knitting stitches out of order.
you start with
4-3-2-1 (4 knit stitches…on left needle)
you slide the first 2 off (onto cable needle (or a DPN))
so you have
4-3 (on left needle)
…/2-1 (hanging in front)
You knit stitches 3 and 4 (from left needle)
then you knit stitches 1 and 2
On the right needle you now have
2-1-4-3 (not 4-3-2-1!) on the right needle
because the stitches are knit out of order, they will be tight… that is normal!
they will be fine in a row or two…
(this tightness is a normal part of cables–which when added to a knit garment change the gauge.)