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I suspect that the interceptors had to be fueled completely before they appear on the overview...
The base listing on the right half represents base missile systems.
Perhaps part of the problem where interceptors do not show up on the list right away is that weapons take a few game hours to install, and any craft without installed weapons will not appear on the intercept list.
I had a campaign with 7 bases with 4-8 fighters each.There I had the bug that my interceptors (ready for combat) simply were not shown in the list of available interceptors.Further: Are you sure that interceptors are not in the list if they install weapons? I believe, they are available for combat - and loose it of course.
You realize that only the first 13 interceptors will be shown on the list, unless you cause it to scroll with the mouse-wheel?
There I had the bug that my interceptors (ready for combat) simply were not shown in the list of available interceptors.