Text says / 1 months instead of /month

Anyone else having this issue? On the demo for this plugin, the text in the shop and in the backend show the text /month or /day or /week when you choose 1 every _______ in the product setup. However, on my site, it’s showing / 1 months, which isn’t good English, and it could confuse people so they think they could purchase multiple months at a time. Just wondering if it is a plugin glitch and others are also having this problem, or a conflict with my site theme or plugins.