Does it connect fine when fluorescent lights are off?
Also guessing it rung out ok after installed for all pairs and that it wasnt just rung out for continuity after making cable but was also rung out after installed so you know that the cable wasnt damaged or pinched in any way when installed?
Additionally if you have extra cable coiled up, it can act like a secondary transformer winding around electrical noise. Its best for extra cable to be slacked out in a ceiling vs coiled up near a source of EMF. If the coiled up extra can be moved away from a EMF problem that works too, but finding the source of the EMF can be tricky sometimes.