This has been tested by S.A team and they are unable to reproduce this issue with Kick 2 inside latest Logic Pro X 10.5 under MacOS Catalina. So it's doesn't look like this is a bug from Kick 2. Unless you have custom key mapping for the space bar & the rewind button inside Logic, I can't see why pressing those will have any effect on Kick 2. Make sure that those keys command are set as their default settings and also make sure that you don't have any automation lanes for Kick 2 on your channel.
BTW, there's a very recent MacOS Catalina 10.15.5 update available from Apple, you might want to upgrade to this latest release as well.
Let us know if the suggested solutions solved your issue, the manual uninstall procedure ( previous post ) is not that complex and doesn't take too much time, just make sure to save your user presets if you have any.