The bottom of Tables did not show in minimal theme

The bottom border of my tables did not show in minimal theme, as shown in the following picture.

What’s reason and how to fix it?

Do have any other styles, css snippets, table-related plugins, … activated?

Thank you for your comments. I tried to turn off all table-related plugins, but the problem still exists. I also tried to change the settings of the “style setting” plugin, but it didn’t work any better.