Lime in compost

only if you are growing pants that like acidic soils. the lime helps break up clay so in some soils it is essential. all the cabbage family like a slightly alkailine soil so the lime will be good here too.
welcome to GoY too.

Unless you deliberately want to grow ericacious plants i.e. lime haters, your soil NEEDS a proportion of lime. That could be your problem. You need to get a soil test kit, they're quite cheap. You may be trying to grow plants that need alkaline conditions, in an acid soil.