The module worked always properly but suddenly I do not know why the design has changed and the custom styles are not showing correctly anymore. And also the items are not beside each other. How can that be fixed?
It seems that you are working with a very old version of Joomla/bootstrap (it has a * Copyright 2012 Twitter, Inc. line).
JD Skillset is working with flex box, and requires a newer version of bootstrap.
If your template accepts custom.css, try to add
JoomDev is not affiliated with or endorsed by Open Source Matters or the Joomla! Project. The Joomla! logo is used under a limited license granted by Open Source Matters the trademark holder in the United States and other countries.