WordPress latest version is 5.1.1, but BoldGrid is a series of plugins and none of them are 5.1. Here’s an example of the versions:
Please also try disabling all of the other plugins but the BoldGrid plugins and see if there is a conflict causing the issue to occur. If the problem recurs, then please provide us with the appropriate version #s for both the plugins and loaded themes and we can investigate the issue in more depth.