I guess this thread belongs to that one:
Can't vertically align text in a cell using toolbar (MENA)
In both threads the MENA version of InDesign CC 2017.1 version 188.8.131.52 on OSX seems to be affected.
Workaround suggested by jane-e
Use the Table Panel instead:
I'll lock this duplicate thread.
Note that this thread is not an exact duplicate — it is two separate OPs with the same issue.