@xd_eltriux Hey! Welcome to Discussions!
Both of the issues mentioned (the joinbug and pbs not saving) are issues that have already been reported to the team. So that we can help keep everything organized and in one place, I'd ask you to please post about each issue in their respective threads. This will make it easier for us to find your information and get it added to the report, and then also update everyone affected by the issues!
You can find the "joinbug" thread here. The most recent thread regarding PB times not saving can be found here.
As for the openplanet plugin not working, are you getting an error when trying to launch the game about the plugin? If so, can you provide an image of the error so I can take a closer look? Please also try these troubleshooting steps and see if they help. Thank you!