While lack of contributions was implied as the reason, I think it likely that shorting the magazine order maybe a method being initiated to have publishers start downloading and printing mags on their own printers. This could be an idea initiated by the WT, an overzealous CO or COBE. As it appears more than one congregation is experiencing similar, it is more likely not just the local COBE's idea.
While the OP didn't state how many mags were shorted, I expect a 'realistic' number for placement were supplied so that members would be forced to print or access a digital version for their families personal use.
As time progresses, expect to see less and less paper documents supplied by WT with an eventual expectation (requirement) that 'Publishers' print literature themselves for placement D2D.