/tickingarea sets a ticking area to a chunk near the specified coordinates instead of being set to it, and Y coordinates is always set to 0

Steps to Reproduce:

1. Run command: /tickingarea add -18 17-3 -6 4 -11 example
2. Observe the result

Expected Results:
You get the result "Added ticking area from -18 17-3 to -6 4 -11"

Observed Results:
You get the result "Added ticking area from -32 0 -16 to -1 0 -1"

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Original Title: Ticking Areas not working!

Original Description: 
The Ticking areas aren't working. None of my pre-existing ticking areas appear to work anymore, and any new ticking areas I add say that they have been placed at the Y Coordinate 0 (As shown in the screenshots.) Please fix this, tickingareas are very important to me!