Mine isn't either. But the temps are colder than I originally thought (for here - not there

) 58 degrees F at night and mid 60s (F) during day right now. Think you might have another issue. Here is my regime - compare it to yours:
1 plant mounted (2 spikes) and 1 plant potted (no spikes) Clue?
Mounted plant get daily dunks with 125ppm Nitrogen MSU and potted plant gets 2-3 waterings per week with same stuff.
Mounted plant dries out totally overnight, potted plant does not.
Mounted plant gets approx 800 FCs light, potted plant less than that, unless sun shines. It's in the south window.
Anything ring a bell with you? BTW, the potted plant is growing new leaf vigorously and new roots. The mounted plant is growing roots, but no new leaf.