Tasks will not accept over 141

I have run into the same trouble as others had on our site (www.ccofpl.org/signup).

I hit the wall at 141 tasks and it will not take any more. I hit the save button when I add and it opens the Add new page.

While at 141, if I hit the save button, it says “saved Tasks successfully”, but when I add 1 more task, the save does not work and opens the new signup page and does not save the entry.

I have tried copying the current sheet to another one and the new one has the same problem.

This appears to be something on the plug in. I just updated it today to 1.12.1 and that did not help either. I made sure all plug-ins are updated and we are stuck at 141.

https://wordpress.org/plugins/pta-volunteer-sign-up-sheets/