The knots aren’t working. Was just rereading Brian King’s ship modeling solutions, he never uses clove hitches, just a half hitch at any scale - it looks good enough. With a dab of glue on the knot both appear the same. Found on rigging the Armed Virginia Sloop, with clove hitches, the shrouds were pulled in like yours. Found it difficult to get the clove hitches tight equally spaced. Shroud tension has a lot to do with it, tight thread today, is not tight tomorrow.
Here is an example of strips of thread laid across the shrouds. The work goes fast. Tieing shroud knots can be a tremendous time suck. Any opportunity to save time is worth a look.
There are many common suggestions in instructions and elsewhere about how to do things. And many of them are not practical - they can’t be executed at scale.
Good luck.
View attachment 631506