Take on of the problem computers, uninstall and reinstall FileMaker to see if this helps. This is a long shot so don't get your hopes up.
I just tried that, I uninstalled FileMaker Pro completely, rebooted, then went into the registry and removed every instance of Filemaker, rebooted again, installed Filemaker, then installed the latest update to FileMaker Pro 14.0.6 (32-bit). Rebooted. Tried the drop downs again and they will work most of the time, then its fails again showing the dropdown, then I quit and reopen Filemaker and then the dropdown work again. Such strange behavior.... I'm tempted to just upgrade that pc to Windows 10.
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I'm actually relieved that it didn't work. There was an issue similar back in v10 that caused issues that could, for a few months or so at a time, be fixed by re-installing. As far as I know, this issue did not occur in later releases of FileMaker so am glad that wasn't the problem here.
Since 14 was released after windows 8, upgrading to 10 may be your only real option.